A sow backfat thickness measuring device and method for breeding

Abstract

The application provides a kind of sow backfat thickness measuring device for breeding, including bottom plate, side cylinder, water inlet pipe, shower arm, base, support pad;Side cylinder is fixed on both sides of bottom plate and top is provided with several rotating grooves, water inlet pipe is sleeved in side cylinder, shower arm passes through rotating groove and is communicated with water inlet pipe, base is fixed on bottom plate, support pad is arranged above base, the side of shower arm towards base is provided with shower nozzle, a pair of shower arms opposite in position are each connected with a push rod, the other end of two side push rods is slidably arranged in sleeve cylinder, sleeve cylinder bottom end is communicated with pressure pump, pressure pump controls two side push rods to drive shower arm to rotate inward or outward, base is communicated with pressure pump, can drive support pad to move up and down.The application realizes the fixation of pig on the basis, realizes the automatic cleaning and disinfection of pig through the control of pressure pump, at the same time, the position of pig is limited, which greatly increases the efficiency and accuracy of backfat thickness measurement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of livestock detection, in particular to a breeding sow back fat thickness measuring device and measuring method. BACKGROUND

[0002] In the process of large-scale pig breeding, sow reproductive performance is one of the important indicators to measure the economic benefit of pig production, and nutritional factors are one of the important factors affecting sow reproductive performance, among which, fat condition is an important indicator reflecting the body condition of sows, which reflects the nutritional status and physical energy reserve of sows at different physiological stages. At present, the back fat thickness measurement of sows in the livestock industry plays an important role in pig breeding. The back fat thickness indicates the amount of fat on the back of the pig. The thicker the back fat, the lower the lean meat rate of the pig, and vice versa. The back fat thickness is an important indicator in pig breeding and performance identification, so accurate measurement of back fat is of great significance. The traditional measurement method is to first slaughter the pig to measure the thickness of the back fat, and then evaluate the lean meat rate of the pig, or separate the bones, meat, fat and skin of the pig to directly calculate the lean meat rate of the pig. Although this measurement method is reliable, it has some drawbacks. First, the pig needs to be slaughtered, which increases the breeding cost. Second, after slaughter and measurement, if the pig has an ideal lean meat rate, but the pig has been slaughtered and cannot be used again, only its siblings or half-siblings can be used, which delays the progress of breeding. Therefore, the live back fat thickness measurement of sows plays an important role in the process of pig breeding.

[0003] There are three common ways to measure the live back fat of breeding sows, namely cutting the skin to measure, inserting a probe to measure, and ultrasonic measurement. The first two methods are low-cost, but they will cause different degrees of pain to the sow. The last method does not cause any harm to the sow, but it requires higher technology and equipment. Although the above three methods have their own advantages and disadvantages, they all have one common feature, which is the high accuracy requirement for the measurement site. When measuring live, the pig to be measured needs to be washed and simply disinfected first, and then the pig needs to be measured while standing naturally. The tightness of the pig's back muscles or the pig's lying posture are not conducive to the accuracy of back fat measurement. To ensure that the pig stands naturally, the measuring pig is usually in a state of activity during the existing measurement process, which makes it difficult to accurately find the back fat measurement point for accurate measurement. The accuracy of the measurement point seriously affects the accuracy of the live back fat thickness of the measured sow, and the confirmation of the existing measurement point is manually found by workers relying on experience. If the operator lacks experience, it is easy to cause inaccurate measurement data, which affects the success rate of subsequent breeding. SUMMARY

[0004] The first object of the present application is to provide a pig breeding sow back fat thickness measuring device capable of accurately fixing pig breeds and automatically cleaning pig breeds.

[0005] Technical scheme: A pig breeding sow back fat thickness measuring device comprises a base plate, side cylinders, a water inlet pipe, a shower arm, a base, and a support pad. The side cylinders are fixed on both sides of the base plate, and a plurality of rotating grooves are formed in the top of each side cylinder. The water inlet pipe is sleeved in the side cylinder. The shower arm penetrates the rotating grooves and is connected with the water inlet pipe. The base is fixed on the base plate. The support pad is arranged above the base. A shower nozzle is arranged on the side of the shower arm facing the base. A pair of push rods are connected with the outermost side of the pair of shower arms. The other ends of the push rods are slidably arranged in the sleeve. The bottom end of the sleeve is connected with a pressure pump. The pressure pump transmits pressure through the sleeve to control the synchronous movement of the push rods inwards or outwards along the sleeve, so as to drive the shower arm to rotate inwards or outwards.

[0006] Further, the base is a hollow structure, and a contraction cylinder is arranged in the base. The contraction cylinder is tightly matched with the inner wall of the base. The bottom of the support pad is connected with a positioning column. The bottom of the positioning column is connected with a piston plate. The piston plate is tightly matched with the inner wall of the contraction cylinder. The bottom of the piston plate is fixedly connected with a first spring.

[0007] Further, the frictional resistance between the piston plate and the contraction cylinder is greater than the frictional resistance between the contraction cylinder and the base.

[0008] Further, the base is connected with the pressure pump. The inner wall of the base is provided with a limiting block matched with the outer wall of the contraction cylinder.

[0009] Further, the positioning column is made of elastic material. The support pad comprises a first support pad and a second support pad. The positioning column comprises a first positioning column and a second positioning column. The first positioning column is fixedly connected with the first support pad. The second positioning column is fixedly connected with the second support pad. A second spring is fixedly arranged between the upper end of the first positioning column and the upper end of the second positioning column. The second spring is in a compressed state. The pressure pump applies pressure to the inside of the base to lift the contraction cylinder. After the contraction cylinder is locked in position by the limiting block, the pressure is stopped, and the positioning column does not move relative to the contraction cylinder. If the pressure continues to be applied, the piston plate continues to push the positioning column upwards until the position of the second spring extends out of the contraction cylinder. The second spring pushes the first and second positioning columns outwards, causing the first and second positioning columns to bend and drive the first and second support pads to separate.

[0010] Further, the push rod is connected with the shower arm through a pair of pulling shafts. The pulling shafts are symmetrically fixed on the two shower arms and are movably sleeved with the push rod.

[0011] Furthermore, an inner guide rail for the auger is fixedly installed inside the water inlet pipe. The spiral directions of the inner guide rails on both sides are opposite. When water flows through the water inlet pipe, it pushes the inner guide rails of the auger, causing both water inlet pipes to rotate outwards from the bottom plate, thereby driving the shower arm to open outwards.

[0012] Furthermore, a top rod is fixedly connected to the top of the shower arm.

[0013] Furthermore, the top rod is engraved with several back fat thickness measurement position marks.

[0014] The present invention also provides a method for measuring the backfat thickness of breeding sows using the above-mentioned backfat thickness measuring device, comprising the following steps:

[0015] (1) Place the pig to be tested on the base plate and position the pig above the support pad;

[0016] (2) Connect the water inlet pipe to the water source, spray water from the shower head, turn on the pressure pump, control the pressure pump to drive the push rod to pull the shower arm to rotate inward, when the shower arm rotates along the rotating groove to the innermost side, control the pressure pump to drive the push rod to push the shower arm to open outward to the maximum angle, repeat the above process until the pig to be tested completes the set time of cleaning.

[0017] (3) Turn off the water source, control the pressure pump to drive the push rod, pull the shower arm to rotate inward, gradually fix the pig to be tested until the shower arm rotates inward to the minimum angle, turn off the pressure pump, and fix the pig on the support pad.

[0018] (4) Record the backfat thickness of the pigs to be tested.

[0019] Beneficial effects: Compared with the prior art, the significant effects of the present invention are:

[0020] 1. This invention uses multiple sets of swingable shower nozzles to automatically rinse and disinfect the surface of the pigs to be tested, avoiding the impact of dirt on the pigs' bodies on subsequent testing. At the same time, the multi-angle controllable automatic rinsing greatly increases the efficiency of pig cleaning.

[0021] 2. The present invention adds a liftable positioning column and support pad to the base plate of the device, which helps the pig to maintain a standing posture with its limbs suspended in the air during cleaning and measurement, thereby fixing the pig. At the same time, it allows the pig to remain upright even under anesthesia, ensuring the stability and reliability of the measurement process.

[0022] 3. This invention provides a detachable support pad that is automatically controlled by a pressure pump to ensure that the long back muscle is in a relaxed and extended state when the pig is standing, thus improving the accuracy of backfat thickness measurement. In this case, the measurement point can be quickly confirmed by the pre-set markers based on expert experience, avoiding the problem of inaccurate measurement data caused by insufficient operator experience.

[0023] 4. It is applicable to three common methods: measuring by cutting the skin after anesthetizing pigs, measuring by inserting a probe, and measuring by ultrasound. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the backfat thickness measuring device for breeding sows in Embodiment 1 of the present invention.

[0025] Figure 2 This is a schematic diagram of the longitudinal section and a partial enlarged view of the backfat thickness measuring device for breeding sows in Embodiment 1 of the present invention.

[0026] Figure 3 This is a schematic diagram of the fixed mode of the backfat thickness measuring device for breeding sows in Embodiment 1 of the present invention.

[0027] Figure 4 This is a cross-sectional schematic diagram of the backfat thickness measuring device for breeding sows in Embodiment 2 of the present invention. Detailed Implementation

[0028] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] Please see Figure 1As shown, this embodiment provides a device for measuring backfat thickness in breeding sows, including a base plate 1, side cylinders 2, a water inlet pipe 3, a shower arm 31, a base 4, and a support pad 6. In this embodiment, the base plate 1 is a rectangular plate, and the side cylinders 2 are fixed on both sides of the base plate 1. Several rotating grooves 21 are symmetrically opened on the top of the side cylinders 2 on both sides. The water inlet pipe 3 is sleeved inside the side cylinder 2. One end of the side cylinder 2 is fixedly connected to a cap 22, and the other end of the side cylinder 2 is open for water to flow into the water inlet pipe 3. The shower arm 31 passes through the rotating grooves 21 and connects to the water inlet pipe 3. The top of the shower arm 31 is connected and fixed by a top rod 32. The size of the rotating grooves 21 limits the size of the shower arm. The shower arm 31 is rotatable. In this embodiment, when the shower arm rotates outward to its maximum angle, it is perpendicular to the base plate 1. The base 4 is fixed on the base plate 1, and the support pad 6 is set above the base 4. A row of shower nozzles 33 is provided on the side of the shower arm 31 facing the base 4. Each of the two outermost pairs of shower arms 31 is connected to a push rod 71. In this embodiment, the push rod 71 is connected to the shower arm 31 through a pair of pull shafts 7. The pull shafts 7 are symmetrically fixed on the two shower arms 31 and are movably connected to the push rods 71. The other ends of the push rods 71 ​​on both sides are slidably set in the sleeve 72. The bottom end of the sleeve 72 is connected to the pressure pump 73.

[0031] Please see Figure 2 As shown, in this embodiment, the base 4 has a hollow structure, and a shrink cylinder 41 is provided inside the base 4. The shrink cylinder 41 fits tightly with the inner wall of the base 4. The bottom of the support pad 6 is connected to the positioning post 5, and the bottom of the positioning post 5 is connected to the piston plate 52. The piston plate 52 fits tightly with the inner wall of the shrink cylinder 41, and the bottom of the piston plate 52 is fixedly connected to the first spring 42. At the same time, the base 4 is connected to the pressure pump 73, and a limiting block 43 is provided on the inner wall of the base 4. The limiting block 43 cooperates with the shrink cylinder 41 for locking. The frictional resistance between the piston plate 52 and the shrink cylinder 41 is greater than the frictional resistance between the shrink cylinder 41 and the base 4.

[0032] In this embodiment, the positioning post 5 is made of an elastic material that can be repeatedly bent and undergoes elastic deformation during operation. Meanwhile, the support pad 6 is made of a soft material and includes a first support pad 61 and a second support pad 62. The positioning post 5 includes a first positioning post 53 and a second positioning post 54. The first positioning post 53 is fixedly connected to the first support pad 61, and the second positioning post 54 is fixedly connected to the second support pad 62. A second spring 51 is fixedly disposed between the upper end of the first positioning post 53 and the upper end of the second positioning post 54, and the second spring 51 is kept in a compressed state.

[0033] In this embodiment, when the positioning column 5 moves to its maximum height, the upper surface of the support pad 6 is more than 100cm away from the base plate 1, ensuring that the pigs can keep their limbs suspended during the cleaning and measurement process, thereby restricting the pigs' movement and keeping them stable throughout the process.

[0034] In this embodiment, the top rod 32 is engraved with several backfat thickness measurement position marks. The backfat thickness measurement position marks are set according to the different body lengths of the pigs and are set by experts based on their experience to avoid the problem of inaccurate measurement data caused by insufficient experience of the operators.

[0035] In this embodiment, the pressure pump 73 is an air pump, the pressure medium is gas, and the control motor of the pressure pump 73 is a variable frequency motor. The variable frequency motor controls the pressure value by controlling its speed. The variable frequency motor control program has two modes: fixed mode and cleaning mode. These two working modes are described below.

[0036] Cleaning Mode: Water is supplied to the inlet pipe 3, and the shower head 33 sprays water jets, activating the cleaning mode. The variable frequency motor controls the pressure pump 73, causing its speed to fluctuate sinusoidally in a positive cycle. The half-cycle time is the same as the time it takes for the shower arm 31 to rotate once from the innermost to the outermost side of the rotating groove 21. At this time, the pressure pump 73 drives the push rod 71 to pull the shower arm 31 to rotate inward. When the shower arm 31 rotates to the innermost side along the rotating groove 31, the variable frequency motor controls the pressure pump 73 to extract air in the opposite direction, and the push rod 71 pushes the shower arm 31 to open outward. The pressure pump 73 is moved to its maximum angle, and the process is repeated to achieve automatic and comprehensive cleaning and disinfection. At the same time, the other end of the pressure pump 73 is connected to the internal space of the base 4, which pushes the shrink cylinder 41 and the piston plate 52 to move upward at the same time, which drives the positioning column 5 to move upward. The first spring 42 is stretched to a length exceeding its original length until the shrink cylinder 41 moves up to the locking position of the limit block 43 and stops. Then the pressure decreases, and under the action of pressure and the pull of the first spring 42, the piston plate 52 and the shrink cylinder 41 are reset. The process is repeated to improve the effect of rinsing and disinfecting various parts of the pig.

[0037] Fixed pattern: Please refer to Figure 2 and Figure 4 As shown, the variable frequency motor controls the pressure pump 73 to extract gas from the sleeve 72 at a fixed speed and pass it into the base 4. At this time, the push rod 71 pulls the shower arm 31 to rotate inward, and the shrink cylinder 41 and the positioning column 5 rise synchronously. The shrink cylinder 41 stops when it moves up to the locking position of the limit block 43. The piston plate 52 continues to rise, causing the upper end of the positioning column 5 to extend out of the shrink cylinder 41. At this time, the second spring 51 pushes the first positioning column 53 and the second positioning column 54 to separate, so that the first support pad 61 and the second support pad 62 separate, the pressure pump is turned off, and the base 4 is sealed. The internal pressure remains unchanged. At this time, the shower arm 31 rotates inward to the minimum angle.

[0038] This embodiment provides a backfat thickness measuring device for breeding sows. By fixing the pigs in place and controlling the pressure pump, the device enables automatic cleaning and disinfection of the pigs. It also takes into account the position of the pigs. The separate support pad allows the pigs to stand in the center with their back muscles relaxed and stretched, which greatly increases the reliability of backfat thickness measurement.

[0039] Example 2:

[0040] This embodiment provides a device for measuring the backfat thickness of breeding sows. Please refer to [link / reference]. Figure 4 As shown, the difference between this device and the backfat thickness measuring device for breeding sows described in Example 1 is that, in this example, an inner guide rail 34 of an auger is fixedly installed inside the water inlet pipe 3, and the spiral directions of the inner guide rails 34 on both sides are opposite. When water flows through the water inlet pipe 3, the water flow pushes the inner guide rail 34 of the auger, causing both water inlet pipes 3 on both sides to rotate outwards from the bottom plate 1, and driving the shower arm 31 to open outwards.

[0041] In this embodiment, the pressure pump 73 is a hydraulic pump, and the pressure medium is a liquid, such as water or oil.

[0042] Apart from the differences mentioned above, the remaining components of the backfat thickness measuring device for breeding sows described in this embodiment and in Embodiment 1 have the same configuration.

[0043] In this embodiment, the control motor of the pressure pump 73 is a variable frequency motor. The variable frequency motor control program has two modes: fixed mode and cleaning mode. The two working modes are described below.

[0044] Cleaning Mode: Water is supplied to the inlet pipe 3, and the water flow pushes the auger inner guide rail 34, causing both inlet pipes 3 to rotate outwards from the base plate 1. This drives the shower arm 31 to open outwards to its maximum angle, activating the cleaning mode. The variable frequency motor controls the pressure pump 73, causing its output pressure value to fluctuate sinusoidally. The half-cycle time is the same as the time it takes for the shower arm 31 to rotate once from the innermost to the outermost side of the rotating groove 21. At this time, the pressure pump 73 drives the push rod 71 to pull the shower arm 31 to rotate inwards. When the shower arm 31 rotates to the innermost side along the rotating groove 31, the pressure pump 73 stops, and the water flow pushes the shower arm 31 again. The inner guide rail 34 of the auger drives the shower arm 31 to open to the maximum angle. The above process is repeated to achieve automatic and comprehensive cleaning and disinfection. At the same time, the other end of the pressure pump 73 is connected to the internal space of the base 4, pushing the shrink cylinder 41 and the piston plate 52 to move upward at the same time, driving the positioning column 5 to move upward. The first spring 42 is stretched to more than its original length until the shrink cylinder 41 moves up to the locking position of the limit block 43 and stops. Then the pressure decreases, and under the action of pressure and the pull of the first spring 42, the piston plate 52 and the shrink cylinder 41 return to their original positions. The above process is repeated to improve the effect of rinsing and disinfecting various parts of the pig.

[0045] Fixed pattern: Please refer to Figure 2 and Figure 4 As shown, the variable frequency motor controls the pressure pump 73 to draw liquid from the sleeve 72 at a fixed speed and direct it into the base 4. At this time, the push rod 71 pulls the shower arm 31 to rotate inward, and the shrink cylinder 41 and the positioning column 5 rise synchronously. The shrink cylinder 41 stops when it moves up to the locking position of the limit block 43. The piston plate 52 continues to rise, causing the upper end of the positioning column 5 to extend out of the shrink cylinder 41. At this time, the second spring 51 pushes the first positioning column 53 and the second positioning column 54 to separate, so that the first support pad 61 and the second support pad 62 separate, the pressure pump is turned off, and the base 4 is sealed. The internal pressure remains unchanged. At this time, the shower arm 31 rotates inward to the minimum angle.

[0046] This embodiment provides a backfat thickness measuring device for breeding sows. Based on Embodiment 1, by setting an inner guide rail of an auger inside the water inlet pipe, the automatic extension of the shower arm can be achieved by using water flow, making full use of energy and saving the energy required by the pressure pump.

[0047] Example 3:

[0048] This embodiment provides a method for measuring the backfat thickness of breeding sows using the backfat thickness measuring device described in Embodiment 1, comprising the following steps:

[0049] (1) Drive the pig to be tested onto the base plate 1, so that the pig’s head faces the direction of the push rod 71 and is above the support pad 6.

[0050] (2) Connect the water inlet pipe 3 to the water source, spray water jets from the shower head 33, turn on the pressure pump 73, and adjust to the cleaning mode. The pressure pump 73 drives the push rod 71 to pull the shower arm 31 to rotate inward. When the shower arm 31 rotates to the innermost side along the rotating groove 31, the frequency converter motor controls the pressure pump 73 to extract gas in the opposite direction. The push rod 71 pushes the shower arm 31 to open outward to the maximum angle. At the same time, the other end of the pressure pump 73 is connected to the internal space of the base 4, pushing the shrink cylinder 41 and the piston plate 52 to move upward at the same time, driving the positioning column 5 to move upward until the shrink cylinder 41 moves up to the locking position of the limit block 43 and stops, so that the pig's limbs are suspended in the air during the cleaning process, thus limiting the pig. Then the pressure decreases, the piston plate 52 and the shrink cylinder 41 reset, and the pig moves synchronously with the support pad 6 and receives all-round cleaning and disinfection. After that, the above process is repeated to complete the cleaning for the set time.

[0051] (3) Turn off the water source and stop the water inlet pipe 3. Turn on the pressure pump 73 and adjust it to the fixed mode. The pressure pump 73 draws out the pressure medium from the sleeve 72 at a fixed speed and passes it into the base 4. At this time, the push rod 71 pulls the shower arm 31 to rotate inward and gradually fixes the pig. At the same time, the shrink cylinder 41 and the positioning column 5 rise synchronously. When the shrink cylinder 41 moves up to the locking position of the limit block 43, it stops. The piston plate 52 continues to rise and drives the upper end of the positioning column 5 to extend out of the shrink cylinder 41. At this time, the second spring 51 pushes the first positioning column 53 and the second positioning column 54 to separate, so that the first support pad 61 and the second support pad 62 separate. At this time, the shower arm 31 rotates inward to the minimum angle. The pig above the support pad 6 is supported and stretched, so that it stands in the center and matches the corresponding backfat thickness measurement position mark. Turn off the pressure pump 73 to seal the base 4. The internal pressure remains unchanged, and the fixation of the pig is completed.

[0052] (4) Select any commonly used measurement method, such as cutting the skin after anesthetizing the pig, inserting a probe for measurement, or ultrasound measurement, and record the measurement of backfat thickness of the pig according to the marked backfat thickness measurement location.

[0053] In this embodiment, if the pig to be tested is measured after anesthesia, after the pig is driven above the support pad 6, the pressure pump 73 can be started to drive the shower arm 31 to rotate inward to limit the pig, and then the pig is anesthetized before cleaning and measurement. At this time, the support pad 6 can still support the anesthetized pig to maintain a standing posture. The cleaning and measurement of the pig can be achieved without moving the support pad 6. This is hereby explained.

[0054] This embodiment provides a method for measuring backfat thickness in breeding sows. Simply place the pig on a base plate and use support pads to limit the pig's position. The cleaning and securing of the pig can then be completed automatically without requiring a large amount of manpower. The process is clean, safe, and stable, and can accurately and firmly fix the pig, greatly improving the efficiency and accuracy of backfat thickness measurement.

Claims

1. A device for measuring backfat thickness in breeding sows, characterized in that, The system includes a base plate (1), side cylinders (2), water inlet pipes (3), shower arms (31), a base (4), and a support pad (6). The side cylinders (2) are fixed on both sides of the base plate (1). Several rotating grooves (21) are provided on the top of each side cylinder (2). The water inlet pipe (3) is sleeved inside the side cylinder (2). The shower arms (31) pass through the rotating grooves (21) and connect to the water inlet pipe (3). The base (4) is fixed on the base plate (1). The support pad (6) is set above the base (4). A shower nozzle (33) is provided on the side of the shower arm (31) facing the base (4). Each pair of shower arms (31) at the outermost position is connected to a push rod (71). The other push rods (71) on both sides are connected to the push rods (71). One end is slidably set inside the sleeve (72), and the bottom end of the sleeve (72) is connected to the pressure pump (73); the base (4) is a hollow structure, and a shrink cylinder (41) is provided inside the base (4). The shrink cylinder (41) is tightly fitted with the inner wall of the base (4). The bottom of the support pad (6) is connected to the positioning column (5). The bottom of the positioning column (5) is connected to the piston plate (52). The piston plate (52) is tightly fitted with the inner wall of the shrink cylinder (41). The bottom of the piston plate (52) is fixedly connected to the first spring (42); the base (4) is connected to the pressure pump (73). The inner wall of the base (4) is provided with a limiting block (43). The limiting block (43) is fitted with the outer wall of the shrink cylinder (41).

2. The backfat thickness measuring device for breeding sows according to claim 1, characterized in that: The frictional resistance between the piston plate (52) and the shrinking cylinder (41) is greater than the frictional resistance between the shrinking cylinder (41) and the base (4).

3. The backfat thickness measuring device for breeding sows according to claim 1, characterized in that: The support pad (6) includes a first support pad (61) and a second support pad (62). The positioning post (5) is made of elastic material. The positioning post (5) includes a first positioning post (53) and a second positioning post (54). The first positioning post (53) is fixedly connected to the first support pad (61), and the second positioning post (54) is fixedly connected to the second support pad (62). A second spring (51) is fixedly installed between the upper end of the first positioning post (53) and the upper end of the second positioning post (54). The second spring (51) is in a compressed state.

4. The backfat thickness measuring device for breeding sows according to claim 1, characterized in that: The push rod (71) is connected to the shower arm (31) via a pair of pull shafts (7). The pull shafts (7) are symmetrically fixed on the two shower arms (31) and are movably connected to the push rod (71).

5. The backfat thickness measuring device for breeding sows according to claim 1, characterized in that: The water inlet pipe (3) is fixedly equipped with an inner guide rail (34) of an auger, and the spiral directions of the inner guide rails (34) on both sides are opposite.

6. The backfat thickness measuring device for breeding sows according to claim 1, characterized in that: A top rod (32) is fixedly connected to the top of the shower arm (31).

7. The backfat thickness measuring device for breeding sows according to claim 6, characterized in that: The top rod (32) is engraved with several back fat thickness measurement position marks.

8. A method for measuring the backfat thickness of breeding sows using the backfat thickness measuring device as described in any one of claims 1-7, characterized in that, Includes the following steps: (1) Place the pig to be tested on the base plate and position the pig above the support pad; (2) Connect the water inlet pipe to the water source, spray water from the shower head, turn on the pressure pump, control the pressure pump to drive the push rod to pull the shower arm to rotate inward, when the shower arm rotates along the rotating groove to the innermost side, control the pressure pump to drive the push rod to push the shower arm to open outward to the maximum angle, repeat the above process until the pig to be tested completes the set cleaning time. (3) Turn off the water source, control the pressure pump to drive the push rod, pull the shower arm to rotate inward, gradually fix the pig to be tested until the shower arm rotates inward to the minimum angle, turn off the pressure pump, and fix the pig on the support pad. (4) Record the backfat thickness of the pigs to be tested.

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