JPH0197449A - Sperm injection method to pig and sperm injector for pig - Google Patents

Abstract

PURPOSE:To enhance a conception rate by bringing sperm injection temp. and a sperm injection time to a state near to natural breeding, by inserting and staying a sperm storage part in the vagina of a sow and subsequently injecting sperm in the uterus. CONSTITUTION:A piston part 13 is set to the male screw rod 31 of a drive part 14. After an injection tube 12 fitted to the depth of the vagina is connected and fixed to a sperm storage part 11 a taper part 16 is detached and a predetermined amount of prepared sperm is allowed to fill the storage main body 15 of said storage part 11 from the leading end opening part thereof and the taper part 16 is then screwed. A sperm injector 10 is inserted in the vagina A of a sow and the engaging part 34 of the mount part 30 of the drive part 14 is engaged with the vaginal opening B of the sow. Thereafter, the spring mechanism of the drive part 14 is driven to rotate the male screw rod 31 and an piston 25 is moved toward the injection tube 12 without being rotated to inject the sperm in the sperm storage part 11 in the uterus. After the elapse of the predetermined time required in injection, the female screw part 26 of a shaft 24 moves to the leading end part of the male screw rod 31 to reach a free part 32 and the screwing of the shaft 24 with the male screw rod 31 is released to finish injection.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a semen injector used for artificial insemination of pigs.

"Conventional Technology" Artificial insemination has been widely used in the field of livestock farming to efficiently breed pigs, cows, horses, etc. By the way, artificial insemination of pigs has the problem of low conception rate because the number of sperm in the semen is low and a large amount of semen must be injected for insemination. A syringe has been proposed.

FIG. 3 shows an example of this type of semen injector, and reference numeral 1 in the figure indicates the semen injector. This semen injector l consists of a cylindrical semen storage section 2, a piston 3 inserted into the semen storage section 2, and an injection tube 4 detachably attached to the tip of the semen storage section 2. It has become.

In order to artificially inseminate a sow using the semen injector 1 having such a configuration, the semen injector 1 is disinfected, and the inside of the semen reservoir 2 is sterilized with the injection tube 4 removed from the semen reservoir 2. After washing with saline or the like, the semen prepared in advance is sucked into the semen storage part 2 by pulling the piston 3. Next, only the injection tube 4 is inserted into the sow's vagina, and its tip is positioned at an optimal injection site within the vagina. Next, connect the semen storage section 2 containing the semen described above to the injection tube 4 inserted into the vagina, hold the semen storage section 2 in your hand, and press the piston 3 to inject the semen into the uterus. Inject into.

[Problems to be Solved by the Invention] However, even with the above-mentioned artificial insemination method using a semen injector, a sufficient conception rate has not yet been achieved.

The present inventor investigated the causes of such a low conception rate and found that one of the reasons was that the semen injection time was approximately several tens of seconds to one minute compared to the time required for natural mating (approximately 6 minutes). Turns out it's because it's short. However, if you use the semen injector mentioned above and inject semen for a sufficient amount of time, for example in winter, the semen in the semen reservoir will be cooled by the outside air and reach the same temperature as the pig's body temperature (approximately 38 degrees). Therefore, even if this semen is injected into the uterus, problems such as regurgitation of the semen due to vaginal contractions or irritation occur, resulting in a problem that conception cannot occur.

[Means for solving the problem] In the first method of injecting semen into pigs in this invention,
The solution to the above problem is to insert at least the semen storage part of a semen injector into the vagina of a sow, and then inject the semen in the semen storage part into the uterus of the sow.

Further, in the knee semen injector of the second invention, a driving part for driving the piston is provided at the rear end of the piston part, so that the semen storage part can be inserted into the sow's vagina, and the driving part is connected to the sow's vagina. The solution to the above problem is to make it possible to indwell a semen reservoir in the sow's vagina by locking it to the vaginal opening.

"Example" Hereinafter, this invention will be explained in detail using the drawings.

FIG. 1 shows a semen injector for pigs for carrying out the present invention, and the reference numeral IO in the figure indicates the semen injector. This semen injector IO includes a cylindrical semen storage section 11 and an injection tube (removably attached to the tip of the semen storage section 11).
It is composed of an injection part) 12, a piston part 13 inserted into the semen storage part II, and a drive part 14 disposed at the rear end of the piston part I3.

The semen storage section II is made of transparent synthetic resin or the like, and consists of a cylindrical storage main body 15 and a tapered section 16 that is removably screwed onto the tip thereof. The reservoir body 15 is formed to have a sufficiently small diameter so that it can be inserted into the sow's vagina A shown by the two-dot chain line in FIG. 1, and a scale indicating the internal capacity is formed on its outer surface. . This storage body I5
A male screw portion 17 for attaching the drive portion 14 is formed on the outer peripheral surface of the rear end portion, and the drive portion 14 is screwed into the rear end portion of the male screw portion 17 in a fluid-tight manner. An O-ring 18 is attached for this purpose. Tapered part I6
is 6 whose diameter gradually becomes smaller as it goes to the tip,
A connecting tube 19 for connecting the sexual entry tube 12 is formed at the tip thereof, and an ejection hole 20 for pouring out the semen in the semen storage section 11 is further formed in this connecting tube 19. has been done. Here, the end portion 16a of the tapered portion 16 is chamfered, thereby forming the semen storage portion 1.
1 is designed to avoid damaging the inside of the sow's vagina A when it is inserted into and removed from the sow's vagina A, which will be described later. In addition, the connecting pipe 19
A male threaded portion 21 is formed in which the injection tube 12 is screwed.

The injection tube 12 is made of a flexible material such as synthetic resin or rubber, and has a tip 12a spirally shaped to fit the sow's genitals. This injection tube 12 has a female threaded portion 22 formed at its rear end for connection to the connecting tube I9 of the semen storage section 11, and the female threaded portion 22 and the connecting tube 19.
The injection tube I2 is fixedly attached to the semen storage section 11 by being screwed together with the male screw section 21 of the injection tube I2. An injection hole 23 is formed in the injection tube 12 along its length so as to communicate with the spout hole 20 . The injection hole 23 has a plurality of openings 23a at the distal end 12a of the injection tube 12, and when injecting semen, in case one of the openings 23
Even if the opening 23a is occluded, the remaining opening 23a allows injection without any problem.

The piston portion 13 is made of metal, synthetic resin, etc., and includes a shaft 24 and a piston 25 attached to the shaft 24.

The shaft 24 has a cylindrical shape, and a female threaded portion 26 is formed at the rear end of its inner circumferential surface to be screwed into a male threaded portion of a drive portion I4, which will be described later. Further, a donut plate-shaped mounting plate 27 is disposed at the tip of the shaft 24, and the piston 25 is fixed to the mounting plate 27 with screws or the like (not shown). piston 25
is a substantially cylindrical shape having a tapered shape with its tip end gradually becoming smaller in diameter, and its outer diameter is formed to approximately match the inner diameter of the semen storage portion 11. This piston 25
An O-ring 28 for holding the inner circumferential surface of the semen storage section 11 and the outer circumferential surface of the piston 25 fluid-tight is attached to the outer circumferential surface of the rear end portion.

The drive section 14 is made of synthetic resin or the like, and includes a drive body 29 for driving the piston section 13, and a mounting section 30 for attaching the drive body 29 to the semen storage section 11. The drive body 29 has a substantially rectangular parallelepiped shape and incorporates a well-known spring mechanism (not shown). Further, this drive body 29 is provided with a male threaded portion 31 which is rotated by the spring mechanism, and the shaft 24 is screwed and attached to this male threaded portion 3I by its female threaded portion 26. In addition, the male thread part 3
A free portion 32 with a slightly smaller diameter than the outer diameter of the male screw portion 31 is formed at the tip of the free portion 31, and a stopper 33 with a large diameter is formed at the tip of the free portion 32. installed. With such a configuration, the male screw portion 3I is rotated by a spring mechanism built into the drive main body 29, thereby moving the piston portion 13 in the distal direction. Mounting part 30
is a substantially cylindrical member formed integrally with the drive body 29 on one side of the drive body 29, and is arranged on the drive body 29 side and has a locking part 34 smaller in diameter than the semen storage part +1; It consists of a tapered part 35 whose diameter gradually becomes larger than that of the locking part 34, and a threaded part 36 which is formed continuously with the tapered part 35 and has a larger diameter than the semen storage part 11. In this case as well, the end portion 35a of the tapered portion 35 is chamfered, so that the locking portion 34 will not damage the inside of the sow's vagina A when it is inserted into or removed from the sow's vagina A, which will be described later. It looks like this.

A female threaded portion 37 is formed on the inner circumferential surface of the threaded portion 36, and is threaded into the male threaded portion I7 of the semen storage portion 11. The drive unit 4 is fixedly attached to the semen storage unit 11.

Based on such a configuration, the drive unit 14 connects the semen storage unit 11
It is detachably attached to the semen storage part 11 during use, and when the semen storage part 11 is inserted into the sow's vagina A, the locking part 34 of the attachment part 30 locks into the vaginal opening B. This allows the semen storage part 11 to be placed in the sow's vagina A.

Although this drive unit 14 has a built-in spring mechanism to rotate the male screw part 31, it may also include a well-known motor and battery, for example.
The male screw portion 31 may be rotated.

Next, a method of using the semen injector 10 having such a configuration will be explained.

Before artificially inseminating a sow, the sow's urine storage is measured in advance using a urine storage meter C as shown in FIG. 2, and an injection tube 12 suitable for the urine storage is prepared.

After preparing such an injection tube 12, in order to perform artificial insemination using the semen injector IO, first disinfect the necessary parts of the semen injector 10, and then disinfect the injection tube I2, the inside of the semen storage section 11, and the piston. Wash the outer surface of the section 13 and necessary parts of the drive section I4 with physiological saline or the like.

Next, the piston portion 13 is set in a predetermined position of the male screw portion 31 of the drive portion 14, as indicated by the two-dot chain line in FIG.

Next, the injection tube 12 is connected and fixed to the semen storage part 11, and with the taper part I6 removed from the semen storage main body 15, a predetermined type (for example, 50 cc) prepared in advance is inserted into the tip opening of the semen storage main body 15. ) is filled into the storage body 15,
Furthermore, the tapered portion 16 is screwed onto the storage main body I5.

Next, this semen injector 10 is inserted into the sow's vagina A from the distal end side of the injection tube 12, and the distal end is positioned at an optimal injection site within the vagina A. Then, since the sow's urine storage is measured in advance and the injection tube 12 that matches this is selected and used,
The locking part 34 of the attachment part 30 of the drive part 14 locks into the sow's vaginal inlet B, which allows the semen storage part 11 to be placed in the vagina A, and furthermore, the drive main body 29 moves along the chain double-dashed line in FIG. By coming into contact with the sow rape shown in and acting as a lid to cover the vaginal opening B, the inside of the vagina A is pressurized when semen is injected, thus preventing the backflow of semen at the tip 12a of the injection tube 12. be done.

Thereafter, the spring mechanism of the drive unit 14 is driven to rotate the male threaded rod 31. Then, the piston portion 13 does not rotate because the outer diameter of the piston 25 is formed to substantially match the inner diameter of the storage body I5, and therefore moves toward the injection pipe I2 at a constant speed. As a result, the semen in the semen reservoir 11 is injected into the uterus through the injection tube 12 at a constant rate. Furthermore, when a predetermined period of time has elapsed, the female screw portion 26 of the shaft 24 moves to the tip of the male screw rod 31 and reaches the free portion 32, and the screw connection between the shaft 24 and the male screw rod 31 is released, and The shaft 24 is a male screw rod 3
The piston part 1 is brought into contact with the stopper 33 of I.
3 stops moving, and the injection of semen ends.

In such a semen injector 10, the injection time can be adjusted, for example, by setting the rotational speed of the male screw rod 31 by the mainspring mechanism at a predetermined speed, or by setting the threads of the male screw rod 31 at a predetermined pitch. The time can be set to match the time required for natural mating, such as 6 minutes, and therefore semen injection can be performed under better conditions. In addition, since the injection is performed with the semen storage part 11 left in the sow's vagina A, the semen can maintain almost the same temperature as the body temperature, almost unaffected by the injection time, even in winter. Therefore, it is possible to perform sperm injection in a state close to natural mating. Furthermore, by providing the drive section 14 for driving the piston section 13, the injection of semen can be performed automatically, and therefore good workability can be obtained. Furthermore, a tapered part 16 is formed on the distal end side of the semen storage part 11, and a mounting part 30 of the driving part 14
By forming the tapered part 35 in the sow vagina A
It can be operated safely without injuring the sow during insertion and removal. And furthermore,
The drive main body 29 of the drive unit 14 comes into contact with the sow and the vaginal opening B
By covering and acting as a lid, the inside of the vagina A is pressurized when semen is injected, and the distal end 1 of the injection tube 12
2a can effectively prevent the backflow of semen. ′ “Effect of the invention” As explained above, the first effect of this invention is
The method for injecting semen into pigs of the invention involves inserting and retaining at least the semen reservoir of a semen injector into the vagina of a sow, and then injecting the semen in the semen reservoir into the vagina of a sow. Even in winter, the semen can be kept at almost the same temperature as the pig's body temperature without being affected by the injection time, making it possible to inject semen in conditions close to natural mating.
Therefore, it is possible to improve the conception rate.

Further, the knee semen injector of the second invention is provided with a driving part for driving the piston at the rear end of the piston part, so that the semen storage part can be inserted into the sow's vagina, and the driving part is connected to the sow's vagina. Since it is possible to indwell the semen reservoir in the sow's vagina by locking it to the vaginal opening, by adjusting the drive part and controlling the drive of the piston part, natural mating can be achieved such that the injection time is 6 minutes, for example. The time can be set to match the required time, and therefore the semen injection can be performed under better conditions. In addition, since the injection is performed while the semen reservoir remains in the sow's vagina, the semen can be kept at almost the same temperature as the pig's body temperature, similar to the first invention, and is therefore close to natural mating. semen injection can be performed in this state, and therefore the conception rate can be improved. Furthermore, by providing a drive section for driving the piston section, the injection of semen can be performed automatically, and therefore good workability can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the semen injector for pigs according to the second invention of the present invention, and FIG. 2 is a stored urine measuring device used in advance when using the semen injector shown in FIG. 1. FIG. 3 is a schematic diagram showing an example of the position of a conventional semen injector. 10... Semen injector, 11... Semen storage part, 12... Injection tube (injection part), 13...
・Piston part, 14... Drive part,

Claims (2)

[Claims] (1) A method for injecting semen into a pig, which comprises inserting and retaining at least the semen reservoir of a semen injector into the vagina of a sow, and then injecting the semen in the semen reservoir into the uterus of the sow. (2) In a semen injector comprising a cylindrical semen storage section, an injection section provided at the tip of the semen storage section, and a piston section inserted into the semen storage section, the piston section A driving part for driving a piston is provided at the rear end, so that the semen storage part can be inserted into the sow's vagina, and by locking the driving part to the sow's vaginal opening, semen is stored in the sow's vagina. A semen injector for pigs, which is characterized by being capable of being indwelled.