JP6647544B2 - Method and system for detecting ruminal bloat in cattle - Google Patents

Description

  According to the present invention, a wireless sensor terminal equipped with a displacement detecting means capable of detecting a change in position is placed in the rumen of a cow by oral administration, and the presence or absence of the onset of ruminal bloat is detected based on the fluctuation of the measurement data. The present invention relates to a method and a system for detecting ruminal bloat in cattle.

  In recent cattle breeding, beef cattle breeding has improved growth and fattening properties, and dairy cattle breeding has improved milk production. In many cases, feed is fed with a high feed rate and low crude fiber content. On the other hand, large intakes of these feeds are liable to cause abnormal fermentation in the rumen and are also a major cause of ruminal bloat in cattle.

  Ruminal bloat in cattle is a disease in which the rumen is filled with a large amount of gas due to markedly enhanced fermentation of the rumen and the rumen is excessively inflated, thereby impairing respiration. It is. Diagnosis itself is often relatively easy due to rapid enlargement of the left tendon and findings from percussion, respiratory pulse, congestive symptoms, etc., but if it has been acute, abdominal circumference should be within 2-3 hours after eating If they are rapidly enormous and do not receive treatment promptly, they may exhibit dyspnea and fall down, and may die within hours. For this reason, it is difficult to detect the onset of the disease at an early stage, particularly in livestock farmers with a large number of breeding heads. For livestock farmers, the economic loss of cattle death from this disease is significant.

  For early detection of an abnormality in the rumen of a cow, for example, a rumen test (test performed by collecting rumen contents) is one of useful means. However, it is necessary to collect rumen contents from the oral cavity of cattle and analyze their components, and special equipment such as X-ray equipment may be required. Considering the labor and cost and the burden on each individual cow, it is practically difficult to carry out the inspection on a daily basis at each farm site. Therefore, there is a need for the development of means for routinely monitoring the condition in the rumen.

In addition, for example, in Patent Document 1, for the purpose of detecting rumen acidosis or the like, a pH sensor is included in a measurement unit housed in a container, and is retained in the rumen by being orally administered to a ruminant. Patent Document 2 discloses a detection device for detecting an internal state in the rumen, which is swallowed by an animal having a ruminant stomach, and is used in an animal body to be used by being retained in the rumen or rumen of a ruminant. Patent Document 3 discloses an individual identification device in which a container such as a temperature sensor, a pH sensor, a vibration sensor, and a conductivity sensor is provided in a container. A monitor system that swallows and detects and transmits the internal organ temperature of a ruminant is disclosed. Patent Document 4 discloses a system that determines the physiological state of a ruminant by monitoring the pH and temperature of the ruminant stomach. Have been. In addition, Patent Documents 5 and 6 are documents relating to an acceleration sensor that detects acceleration by a change in charge due to a piezoelectric effect.
International Publication WO2010 / 147175 JP-A-6-276877 US5,984,875 US2004-133131 JP 2011-226995 A JP 2012-242250 A

  As described above, in order to be able to detect abnormalities in the rumen of cattle at an early stage, means for routinely monitoring the condition in the rumen is necessary. However, even if the sensor is placed in the rumen, the temperature sensor cannot sufficiently detect the onset of ruminal bloat in cattle. In addition, although a method of placing a pH sensor in the rumen to detect the onset of rumen acidosis may be effective to some degree in detecting bloat, the pH sensor can be used to check the reference solution every two months. Due to the need for replacement, it is substantially difficult to keep the sensor in the rumen for long periods of time and continue monitoring.

  Therefore, an object of the present invention is to provide a means for detecting ruminal bloat in cattle, which can be monitored on a daily basis for a long period of time and has high detection accuracy.

The present inventors have a substantially cylindrical shape, provided with a displacement detecting means capable of detecting a change in position, can be placed in the rumen of a cow by oral administration, and transmit the measurement data to the outside of the individual cow. with it to develop an oral dosage form wireless sensor terminals capable, (1) when the weight density 1.8gf / cm ³ or more, it can be the wireless sensor device for a long time left in the rumen, (2) When a substantially cylindrical wireless sensor terminal is placed in the rumen, the change in the position of the wireless sensor terminal is detected by the mutation detecting means to detect the fluidity of the contents in the rumen. (3) that the fluidity of the contents in the rumen and the ruminal contraction movement are almost perfectly synchronized, and therefore, by evaluating the fluidity of the contents in the rumen, Ruminal contraction movement can be detected, and (4) It has been newly found that the presence or absence of onset of ruminal bloat in cattle can be detected by the fluctuation of the measurement data of the column.

Therefore, in the present invention, a wireless sensor having a substantially cylindrical shape, a weight density of 1.8 gf / cm ³ or more, and a displacement detecting means capable of detecting a position change and a wireless transmitting means for wirelessly transmitting measurement data of the displacement detecting means. The terminal is placed in the rumen of the cow by oral administration, the measurement data of the displacement detecting means is obtained outside the body of the individual cow, and the onset of ruminal bloat is detected by detecting a change in the measurement data. A method for detecting ruminal bloat in cattle for detecting the presence or absence thereof is provided.

  By placing a wireless sensor terminal having displacement detection means in a substantially cylindrical shape in the rumen of a cow, the fluidity of the contents in the rumen can be detected, and the contents in the rumen can be detected. By evaluating the fluidity of the object, the ruminal contraction movement can be detected. On the other hand, ruminal bloat in cattle is accompanied by a decrease in ruminal contraction movement, so when ruminal bloat develops, the measurement data (waveform) clearly fluctuates. Therefore, the presence or absence of the onset of ruminal bloat in cattle can be detected with high sensitivity, high accuracy and deterministically.

In the present invention, by adjusting the weight density of the wireless sensor terminal, it is possible to adjust the time that the wireless sensor terminal stays in the rumen, for example, the weight density of the wireless sensor terminal is 1.8 gf / cm ³ or more By doing so, the wireless sensor terminal can be left in the rumen for a long time. In addition, since the present invention employs displacement detection means such as an acceleration sensor, it is not necessary to periodically collect and maintain the wireless sensor terminal as in the case of replacing a reference liquid in a pH sensor. Furthermore, since the power consumption can be reduced by employing a displacement detecting means such as an acceleration sensor, it is possible to operate the wireless sensor terminal for a long time with almost no need for battery replacement or the like. Therefore, according to the present invention, it is possible to monitor the presence or absence of ruminal bloat on a daily basis for a long period of time.

  And in this invention, since it is possible to monitor on a daily basis for a long period of time, and it is possible to acquire the measurement data with time continuously, the onset of ruminal bloat can be early. Can be found. Therefore, it is possible to deal with the disease at an early stage of the onset, so that ruminal bloat can be prevented from becoming serious, and the economical loss due to death of the cattle raised by this disease can be suppressed.

  In addition, the present invention has the advantage that detection and monitoring of the presence or absence of ruminal bloat can be performed non-invasively. In the present invention, by placing the wireless sensor terminal in the rumen by oral administration, it is possible to detect and monitor the presence or absence of the onset of ruminal bloat, and to measure bovine individuals by surgery or the like. There is no need for mounting. Further, since the wireless sensor terminal can be miniaturized by employing a displacement detecting means such as an acceleration sensor, oral administration of the wireless sensor terminal can be performed relatively easily. Therefore, the load on the individual cow to be monitored can be reduced as much as possible, and non-invasive detection and monitoring can be performed.

  In addition, the present invention provides that a wireless sensor terminal equipped with a displacement detection means and a wireless transmission means for wirelessly transmitting the measurement data is left in the rumen by oral administration, and the measurement data is continuously stored outside the body of the individual cow for a long time. Since it is possible to detect the onset of ruminal bloat by obtaining the ruminal bloat, it is possible to construct a mechanism for ruminal bloat detection relatively easily and inexpensively.

  In this way, it is possible to relatively easily and inexpensively construct a mechanism for detecting ruminal bloat, and in addition, collectively manage, monitor, and monitor wirelessly transmitted measurement data using a server computer or the like. Since analysis is also possible, the present invention can be applied to a case where a large number of reared cattle are monitored simultaneously. Therefore, the present invention is also useful, for example, in livestock farmers with a large number of breeding heads, when it is desired to monitor the presence or absence of ruminal bloat on all cattle breeding cattle. The delay in the discovery of the disease can be prevented, and the economic loss due to the death of domestic cattle from the disease can be suppressed.

  In addition, there is an advantage that the wireless sensor terminal according to the present invention is unlikely to cause a trouble and stable monitoring can be performed for a long period of time. Since the wireless sensor terminal according to the present invention detects ruminal contraction by a displacement detecting means such as an acceleration sensor, it is necessary to guide a sample (such as ruminal fluid) into the terminal like a pH sensor, for example. There is no. Therefore, the internal structure of the wireless sensor terminal can always be substantially isolated from the outside, and is protected from the external environment (the environment in the rumen), and there is no occurrence of clogging. Therefore, the occurrence of a defect can be suppressed low. In addition, since the structure can be simplified by adopting the displacement detecting means, problems are unlikely to occur.

  According to the present invention, ruminal bloat in cattle can be detected with relatively high accuracy. In addition, the present invention can be used for daily monitoring over a relatively long period of time for the onset of ruminal bloat, and is also applicable to a case where a large number of cattle are to be monitored at once. It is possible.

<Bovine rumen bloat detection system according to the present invention>
The present invention has a substantially cylindrical shape, a weight density of 1.8 gf / cm ³ or more, a displacement detecting means capable of detecting a change in position, and a wireless transmitting means for wirelessly transmitting measurement data of the displacement detecting means. An orally administered wireless sensor terminal to be placed in the rumen by administration, a relay unit for receiving the measurement data transmitted from the wireless sensor terminal and transmitting the received data to a data management unit, and the relay unit A data processing means for processing the transmitted measurement data, and a ruminal bloat detection system for cattle, which detects the presence or absence of ruminal bloat by detecting a change in the measurement data. Include all. Hereinafter, an example thereof will be described with reference to FIGS. Note that the present invention is not narrowly limited to only this embodiment.

  FIG. 1 is a schematic diagram showing an example of the overall configuration of a bovine rumen bloat detection system according to the present invention.

  The bovine rumen bloat detection system A of FIG. 1 includes a wireless sensor terminal B placed in the rumen C1 of a cow individual C, and data processing means for processing measurement data of the displacement detecting means of the wireless sensor terminal B. And S. Further, the bovine rumen bloat detection system A of FIG. 1 includes a relay procedure I for receiving the measurement data transmitted from the wireless sensor terminal B and transmitting the received data to the data processing means S. Has become.

  In FIG. 1, the measurement data of the displacement detection unit of the wireless sensor terminal B is transmitted to the relay unit I by wireless transmission, and then transmitted from the relay unit I to the data processing unit S.

  The relay unit I relays transmission of measurement data from the wireless sensor terminal B to the data processing unit S. The installation of the relay means I is optional. For example, by installing the relay means I and installing the relay means I near the individual cow C (wireless sensor terminal B), wireless transmission from the wireless sensor terminal B can be performed. Since the power consumption at the time of performing the operation can be reduced, the wireless sensor terminal B can be operated for a long period of time while being left in the cow rumen C1.

  As the relay means I, known means can be widely used, and there is no particular limitation. The location of the relay means I is not particularly limited. For example, the relay means I may be attached to (the outer surface of) the individual cow C, such as a collar, or may be installed at a predetermined location in the barn. In addition, the configuration may be such that the measurement data transmitted from the plurality of wireless sensor terminals B, that is, the plurality of cow individuals C at the same time is relayed by one relay unit I.

  The data processing unit S is a unit that processes measurement data of the displacement detection unit in the wireless sensor terminal B. As the data processing unit S, a known unit such as a server computer, a personal computer, and a tablet-type portable terminal can be widely used. The data processing unit S performs, for example, any one or a plurality of processes of reception, storage, display, output, analysis, data management, and the like of the measurement data transmitted from the wireless sensor terminal B.

  Communication of data between the relay means I and the data processing means S can widely adopt a known method, widely encompasses both wireless and wired connections, and also via a network such as the Internet. It may be connected.

  FIG. 2 is a schematic diagram showing an example of the internal configuration of the wireless sensor terminal according to the present invention.

  In the wireless sensor terminal B of FIG. 2, an electronic board is housed in a container 1, and the electronic board has a displacement detecting means 2 capable of detecting a change in position, and a conversion circuit for converting measurement data of the displacement detecting means 2 into DC. 3, a wireless transmission unit 4 for wirelessly transmitting the measurement data to the outside, a CPU 5, a storage unit 6, and a power supply unit 7.

  The external shape of the wireless sensor terminal B is not particularly limited, but a shape having a longitudinal direction and a lateral direction, for example, a substantially cylindrical shape (in the present invention, a substantially cylindrical shape, a substantially polygonal cylindrical shape, a substantially bullet shape, a substantially egg shape, A substantially elliptical shape or the like is included.) Is suitable for reliably detecting a change in the position of the wireless sensor terminal B in the cow rumen C1. Further, by forming in this shape, there is also an advantage that the load on the bovine individual C due to oral administration can be reduced as much as possible.

  The size of the wireless sensor terminal B is not particularly limited, but since the wireless sensor terminal B is to be placed in the bovine rumen by oral administration, it is of a degree that does not exert an excessive burden when administered to the cow individual C. Good size. For example, when formed in a substantially cylindrical shape, the length (maximum diameter in the longitudinal direction) is preferably 50.0 to 150.0 mm, more preferably 50.0 to 120.0 mm, and even more preferably 50.0 to 80.0 mm, (Maximum diameter in the transverse direction) may be preferably 15.0 to 45.0 mm, more preferably 15.0 to 35.0 mm, and still more preferably 15.0 to 30.0 mm.

By adjusting the weight density of the wireless sensor terminal B, the indwelling time of the wireless sensor terminal B in the cow rumen C1 can be adjusted. For example, when adjusting the weight density of the wireless sensor terminal B to 1.3gf / cm ^3, the wireless sensor terminal B is discharged from the anus to about 3 days after oral administration, when adjusted to 1.5 gf / cm ^3, the wireless sensor nodes B is excreted from the anus about 1 month after oral administration, whereas when adjusted to 1.8 gf / cm ³ or more (for example, 1.8 to 8.0 gf / cm ³ ), the wireless sensor terminal B has a longer length after oral administration. Detained in the cow rumen C1 for a period. In addition, when a structure that can change the weight of the wireless sensor terminal B, for example, a weight portion that can be attached and detached from the outside of the cow individual C is attached to the wireless sensor terminal B, and there is a problem with the acceleration sensor 2 or the like By dropping the weight portion, the wireless sensor terminal B can be discharged out of the cow individual C.

  The container 1 is, in principle, a member for housing an electronic board on which the displacement detecting means 2 and the wireless transmission means 3 for wirelessly transmitting the measurement data of the displacement detecting means 2 are mounted. Are housed in a fixed state. The container 1 is substantially sealed, and the contents in the cow rumen C1 and the inside of the container 1 are completely completely shut off in principle. Thereby, it is possible to normally operate each component on the electronic board over a period in which the wireless sensor terminal B is placed in the rumen, and it is possible to prevent trouble and deterioration of each component on the electronic board. .

  As for the material of the container 1, the deterioration resistance performance is such that it can withstand the rumen contents even for a long period of time, and the strength that can maintain the shape for a certain period with respect to the physical pressure due to the movement in the rumen. As long as it has, a well-known thing can be widely adopted and it is not limited.

  The displacement detecting means 2 is a part that detects a change in the position of the wireless sensor terminal B. In the present invention, the measurement data of the displacement detection means 2 is acquired as a waveform (a waveform representing displacement over time) representing a change over time in the position of the wireless sensor terminal B in the bovine rumen C1. This measurement data correlates with the fluidity of the contents in the bovine rumen C1, and further with the rumen contraction movement.

  As the displacement detecting means 2, any means can be used as long as it can detect a change in the position of the wireless sensor terminal B in the rumen, and any known means can be widely used, and is not particularly limited. For example, the displacement detecting means 2 that can detect a change in position in one axis (one direction), two axes (two directions in the XY axis), or three axes (three directions in the XYZ axis) may be used. As the displacement detecting means 2, for example, a known acceleration sensor can be used. Further, in the rumen, when an external force from a specific direction is applied to the wireless sensor terminal B, it is estimated that the position change of the wireless sensor terminal B occurs in correlation with the strength, for example, By laying a plurality of piezoelectric bodies on the outer surface of the wireless sensor terminal B such that the detection surfaces are oriented in a plurality of axial directions, and by adopting a configuration capable of detecting a change in pressure from each direction, the inside of the rumen can be detected. , A change in the position of the wireless sensor terminal B can be detected. In this case, only the mutation detecting means 2 is laid outside the container 1, but the terminal of the mutation detecting means 2 is connected to the electronic board, and members other than the mutation detecting means 2 are placed in the container 1. By substantially sealing, the same strength and durability can be maintained.

  When an acceleration sensor is used as the displacement detecting means 2, a known small acceleration sensor, for example, an acceleration sensor made by MEMS (Micro Electro Mechanical System) technology can be widely used as the acceleration sensor. For example, an acceleration sensor that measures displacement of a sensor mass portion by any of a change in capacitance, a change in electric resistance due to a piezoresistance effect, a change in electric charge due to a strain gauge, and a piezoelectric effect can be widely used.

  For example, if the displacement detecting means 2 employed is provided with a piezoelectric body formed of an organic piezoelectric thin film and has a structure for detecting a position change by a change in charge due to a piezoelectric effect, (1) no drive power is required, In principle, the standby power can be reduced to zero, so that battery replacement is almost unnecessary and the wireless sensor terminal B can be operated for a longer period of time. (2) Measurement data without using an AD converter The digital sensor can be used to simplify the structure of the mounted components, making the wireless sensor terminal B more compact. (3) By using an organic piezoelectric thin film for the piezoelectric element, it is possible to form a stronger piezoelectric body and measure acceleration. Even when large deformation, stress, and pressure are applied, it does not break, which enables more accurate and sensitive detection of position change. (4) Withstands large deformation, stress, and pressure during position change measurement. That pressure The order can be made larger amount of power generation by converting into a voltage, for example, by power storage the power supply unit 7 can be further reduced power consumption, there is advantage in terms of. In addition, for example, by configuring the displacement detecting means 2 with a built-in CMOS switch, the power consumption can be further reduced. As the organic piezoelectric thin film, a known material, for example, a PVDF thin film or the like can be adopted.

  As a result of independent investigation, the present inventors have found that when a substantially cylindrical wireless sensor terminal B is placed in the cow rumen C1, the position in the axial direction substantially coincident with the long axis direction of the wireless sensor terminal B It was newly found that the waveform representing the change over time was synchronized with the ruminal contraction movement. Therefore, for example, as the measurement data, a waveform representing a change over time in a position in an axial direction substantially coincident with the major axis direction of the wireless sensor terminal is obtained, and a change in the waveform is detected, thereby detecting a change in the ruminal volume of a cow. By adopting a configuration for detecting the occurrence of bloat, the presence or absence of the onset of the disease can be detected with high sensitivity, high accuracy, and deterministically.

  In this case, the displacement detecting means 2 capable of detecting a position change in only one axis (one direction) can also detect a position change in an axial direction substantially coinciding with the long axis direction of the wireless sensor terminal B. However, by using the displacement detecting means 2 capable of detecting a change in position in two axes (two directions in the XY axis) or three axes (three directions in the XYZ axis), the movement and movement of the individual cow C, Since the movement, rotation, orientation, and the like of the wireless sensor terminal B in C1 can also be detected, it is possible to make a determination in consideration of these, and the detection accuracy of the onset of the disease can be further increased.

  The evaluation of the measurement data of the displacement detecting means 2 can be performed based on, for example, the magnitude and number of peaks of the waveform within a certain time, the amount of change in the waveform, the integrated value of the measurement data within the certain time, and the like.

  In a normal state (when ruminal bloat does not occur), a waveform representing a position change in the axial direction substantially coincident with the long axis direction of the wireless sensor terminal B greatly fluctuates, and a peak appears. The fluctuation of the waveform varies depending on the behavioral state of the individual cow C, and is largest during foraging, and decreases in the order of rumination and rest. In any of the behavioral states, the fluctuation of the waveform can be detected. On the other hand, at the onset of ruminal bloat, the peak of the waveform disappears and the fluctuation becomes small. Therefore, for example, when the waveform of the measurement data is different from the waveform at the time of normal, it is determined that there is a possibility of the onset of ruminal bloat, so that the presence or absence of the onset of ruminal bloat in the cow is determined. Can be detected early.

  When the displacement detecting means 2 has a structure for measuring the displacement of the sensor mass portion by a change in electric charge due to the piezoelectric effect, for example, in the CPU 5, the number of times that the output voltage generated in the piezoelectric element due to acceleration exceeds a predetermined threshold value is determined. The configuration may be such that counting is performed, and when the counted number reaches a preset numerical value, the fact or measurement data is transmitted to the wireless transmission means 4. In this case, the presence or absence of ruminal bloat is determined based on the data transmission frequency. In this case, since the event-driven system is used, the power used for wireless transmission can be reduced, so that the power consumption can be further greatly reduced.

  The conversion circuit 3 is a part for converting the measurement data of the displacement detection means 2 into DC, and is arranged when the measurement data of the displacement detection means 2 cannot be obtained as a DC output. In addition, when the measurement data of the displacement detecting means 2 is analog, an AD converter and the like may be arranged together, and when the measurement data of the displacement detecting means 2 is weak, an amplifier and the like may be arranged together.

  The wireless transmission means 4 is a part for transmitting the measurement data of the displacement detection means 2 to the outside of the individual cow C. As the wireless transmission means 4, a known means can be widely used and is not particularly limited. Increasing the frequency of data transmission by the wireless transmission means 4 can increase the accuracy of measurement data, while reducing the frequency of transmission can reduce power consumption and enable long-term measurement. .

  The power supply unit 7 is a power supply source for electronic components in the wireless sensor terminal B. As the power supply unit 7, a known power supply unit can be widely used and is not particularly limited. For example, when the displacement detecting means 2 has a structure for detecting a position change using a piezoelectric body, the power supply unit 7 is configured to be capable of storing an output voltage generated in a piezoelectric element due to a pressure applied to the piezoelectric body. In addition, power consumption can be further greatly reduced.

<Method for detecting bovine rumen bloat according to the present invention>
The present invention, including those by the bovine rumen bloat detection system, in a substantially tubular shape, and the weight density 1.8gf / cm ³ or more, the measurement of the displacement detector and the displacement detecting means can detect a change in position A wireless sensor terminal equipped with a wireless transmission means for wirelessly transmitting data is left in the rumen of a cow by oral administration, and the measurement data of the displacement detection means is obtained outside the body of the individual cow, and the fluctuation of the measurement data is obtained. Ruminal bloat detection method for cattle, which detects the occurrence of ruminal bloat by detecting the presence of ruminal bloat.

  According to this method, it is possible to routinely monitor the presence or absence of ruminal bloat for a long period of time, and it is also possible to detect sensitivities with high sensitivity, high accuracy and deterministically.

  As described above, for example, as the measurement data, a waveform representing a change over time in an axial direction substantially coincident with the major axis direction of the wireless sensor terminal is acquired, and the change in the waveform is detected to obtain the second data of the cow. By adopting a configuration for detecting the onset of ruminal bloat, the presence or absence of the onset of the disease can be detected with high sensitivity, high accuracy, and deterministically.

  The method for detecting bovine rumen bloat may include a relay procedure for receiving the measurement data transmitted from the wireless sensor terminal and transmitting the received data to data processing means. Thus, power consumption when wireless transmission is performed from the wireless sensor terminal can be reduced, so that the wireless sensor terminal can be operated for a long period of time while being left in the cow rumen.

  In addition, when the displacement detecting means has a structure in which a piezoelectric body formed of an organic piezoelectric thin film is provided and a position change is detected by a change in electric charge due to a piezoelectric effect, power consumption can be further reduced, and the power consumption can be reduced over a long period of time. This makes it possible to operate the wireless sensor terminal B and detect acceleration with higher accuracy and sensitivity.

  In Example 1, it was examined whether the ruminal contraction movement could be detected by the acceleration sensor.

  A wireless sensor terminal according to the present invention was prototyped. A commercially available triaxial acceleration sensor (trade name “CMA3000-D01”, manufactured by Murata Electronics), a wireless transmission circuit and an antenna for transmitting the measurement data, and a battery are mounted on the electronic substrate, and the electronic substrate is mounted on the electronic substrate. It was fixed and accommodated in a cylindrical container having a diameter of 80 mm and a diameter of 35 mm. Further, a repeater for receiving the measurement data transmitted from the wireless sensor terminal and transmitting the received data to the computer was prepared in the laboratory, and connected to a computer for recording and outputting the measurement data. Then, the measurement data of the acceleration sensor was recorded by a computer.

  The force transducer method is a method in which a force transducer is directly sewn to a gastrointestinal tract or the like by a surgical operation to derive a contraction motion of the gastrointestinal tract or the like, and is a method conventionally used in a test for deriving a gastrointestinal tract motion. With reference to this method, a fistula was formed in the rumen of a test cow by a surgical operation, and a force transducer was sewn to measure. As a result, the ruminal contraction movement could be recorded by the Force transducer.

  Next, the prototype wireless sensor terminal was inserted into the rumen from a fistula and left in place, and acceleration was measured by the wireless sensor terminal and measurement by a force transducer was also performed at the same time.

The results are shown in Figure 3. FIG. 3 is a graph in which the measurement result of acceleration by the wireless sensor terminal according to the present invention and the measurement result by Force transducer are superimposed. The horizontal axis represents elapsed time in FIG. 3 (unit: min), the left vertical axis measurements by wireless sensor terminal (acceleration, unit: unit (50 unit = 9.8m / S 2 and the set value, the same below )), And the vertical axis on the right side represents the value measured by the force transducer (contractile force, unit: g), respectively. In addition, reference symbol R1 in FIG. 1 is a waveform representing a temporal change in acceleration by the wireless sensor terminal, and substantially coincides with the long-axis direction of the wireless sensor terminal among a plurality of axial measurement data by the three-axis acceleration sensor. It is a waveform showing the acceleration change in the axial direction. A symbol T1 is a waveform representing a change over time of a measurement value obtained by the force transducer. A circled portion (for example, symbol a) in FIG. 1 indicates a portion where the waveform of the acceleration by the wireless sensor terminal and the waveform of the measurement value by the force transducer are synchronized.

  As shown in FIG. 3, among the three-axis acceleration waveforms of the wireless sensor terminal, the waveform representing the change in acceleration in the axial direction substantially coinciding with the long-axis direction of the wireless sensor terminal and the waveform of the measured value by the force transducer are highly advanced. It turned out to appear in tune.

  This result indicates that among the three-axis acceleration waveforms obtained by the acceleration sensor, the waveform representing the change in acceleration in the axial direction substantially matching the long-axis direction of the wireless sensor terminal is synchronized with the ruminal contraction movement, that is, the bovine This shows that by placing an acceleration sensor in the rumen, ruminal contraction movement can be detected.

  In Example 2, it was verified whether or not the onset of ruminal bloat in cattle can be detected by the acceleration sensor.

  FIG. 4 is a graph in which the wireless sensor terminal prototyped in Example 1 was placed in the rumen of the test cow of Example 1 and the change with time of the acceleration was recorded. The horizontal axis in FIG. 4 represents the passage of time (unit: min), and the vertical axis on the left side represents a measurement value (acceleration, unit: unit) by the wireless sensor terminal. The symbol R2 in the figure is a waveform representing a temporal change in acceleration by the wireless sensor terminal. As shown in FIG. 4, approximately 1 to 3 peaks were detected in one minute during the entire measurement time.

  On the other hand, FIG. 5 shows that the rumen contraction movement of the test cow of Example 1 was stopped to reproduce ruminal bloat, and the wireless sensor terminal prototyped in Example 1 was placed in the rumen. 5 is a graph in which the change with time of the acceleration is recorded. The horizontal axis in FIG. 5 represents the passage of time (unit: min), and the vertical axis on the left side represents the measurement value (acceleration, unit: unit) by the wireless sensor terminal. Further, a symbol R3 in the figure is a waveform representing a temporal change in acceleration by the wireless sensor terminal. As shown in FIG. 5, when ruminal bloat was reproduced, no clear peak was detected in the waveform of the measurement data.

  This result indicates that the presence of ruminal bloat can be detected by placing an acceleration sensor in the rumen of a cow.

  In Example 3, the relationship between the weight density of the wireless sensor terminal and the indwelling time in the rumen was examined.

Each of the wireless sensor terminals whose weight density was adjusted to 1.3 gf / cm ³ , 1.5 gf / cm ³ , and 2.0 gf / cm ³ was orally administered to the test cow.

As a result, adjusted for the weight density of the wireless sensor terminal B to 1.3gf / cm ^3, the wireless sensor node is discharged from the anus to about 3 days after oral administration, when adjusted to 1.5 gf / cm ^3, the wireless sensor nodes B was excreted from the anus 37 days after oral administration. On the other hand, when the weight density of the wireless sensor terminal was adjusted to 2.0 gf / cm ³ , the wireless sensor terminal was kept in the rumen C1 for a long time after oral administration.

From this result, by adjusting the weight density of the wireless sensor terminal, the indwelling time of the wireless sensor terminal in the rumen can be adjusted, and the weight density of the wireless sensor terminal is adjusted to 1.8 gf / cm ³ or more. It was found that the wireless sensor terminal could be left in the rumen for a long period of time.

FIG. 1 is a schematic diagram showing an example of the overall configuration of a bovine rumen bloat detection system according to the present invention. FIG. 2 is a schematic diagram showing an example of an internal configuration of a wireless sensor terminal according to the present invention. 7 is a graph in which the measurement result of acceleration by the wireless sensor terminal according to the present invention and the measurement result by Force transducer are superimposed in the first embodiment. FIG. 9 is a graph in which a change over time in acceleration is recorded when a wireless sensor terminal is placed in the rumen of a normal cow in Example 2. FIG. FIG. 7 is a graph in which time-dependent changes in acceleration when a wireless sensor terminal is placed in the rumen of a cow that experimentally developed ruminal bloat in Example 2. FIG.

1 container
2 Displacement detection means
3 Conversion circuit
4 Wireless transmission means
5 CPU
6 Memory
7 Power supply
A Cattle rumen bloat detection system
B support
I Relay means
S Data processing means

Claims (5)

A substantially cylindrical shape, the weight density 1.8 ~8.0 gf / cm ^3, by oral administration of wireless sensor terminal having a wireless transmitting means for wirelessly transmitting the measurement data of the displacement detecting means and the displacement detecting means can detect a change in position It is left in the rumen of a cow, and outside the body of the individual cow, as the measurement data of the displacement detecting means , the position change in the rumen in the axial direction substantially coinciding with the long axis direction of the wireless sensor terminal. A method for detecting ruminal bloat in cattle, which acquires a waveform represented over time and detects the occurrence of ruminal bloat by detecting a change in the waveform .   2. The method for detecting rumen bloat in cattle according to claim 1, further comprising a relay procedure of receiving the measurement data transmitted from the wireless sensor terminal and transmitting the received data to data processing means. 3. The cattle bloat detection method according to claim 1 , wherein the displacement detection means includes a piezoelectric body formed of an organic piezoelectric thin film, and has a structure for detecting a position change by a change in electric charge due to a piezoelectric effect. The method according to any one of claims 1 to 3 , wherein the displacement detecting means is an acceleration sensor. A substantially cylindrical shape, the weight density 1.8 ~8.0 gf / cm ^3, a wireless transmission unit for wirelessly transmitting the measurement data of the displacement detecting means and the displacement detecting means can detect the position change, the oral administration to cattle An orally administered wireless sensor terminal to be placed in the stomach,
Relay means for receiving the measurement data transmitted from the wireless sensor terminal and transmitting the received data to data management means,
Data processing means for processing the measurement data transmitted from the relay means,
As the measurement data , a waveform representing a change over time in a position in the rumen in an axial direction substantially coinciding with the long axis direction of the wireless sensor terminal is obtained, and a change in the waveform is detected to detect a change in the waveform. A ruminal bloat detection system for cattle that detects the presence or absence of bloat.

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