Artificial semen collection technology of pigs
An ideal method of semen collection, it should have the following four conditions: (1) it can collect all the semen emitted by boars at one time; (2) it does not affect the semen quality; (3) whether the reproductive organs and sexual functions of boars will be damaged or affected; (4) the instruments are simple and easy to use.
The methods of artificial semen collection include electrical stimulation, false vagina, hand grip and tube grip.
1. Electrical stimulation is to insert a probe with an electrode into the rectum of a boar and stimulate the ejaculation center of the reproductive tract with a low voltage pulse to induce ejaculation. semen can be obtained even if the penis is not fully straightened. The semen obtained by this method is thinner than natural mating, and the success rate is not high. This method is suitable for semen collection of boars which are unable to climb because of leg injury but have high breeding value.
2. The false vagina method uses a fake vagina that simulates the vaginal environment of sows. When boars climb over estrus sows or Taiwan pigs, semen is collected. This method is convenient, but it is time-consuming and laborious, so it is seldom used now.
3. Using boar semen by hand grip and barrel grip is a widely used method at present, which has the advantages of simple equipment, convenient operation and the ability to collect semen rich in sperm, but its disadvantage is that semen is easy to be contaminated and affected by low temperature.
Manual semen extraction imitates the binding force of sow cervix on boar spiral penis glans and causes ejaculation. therefore, it is very important to hold semen under proper pressure.
Hand-held semen collection must follow the following three principles: (1) the spiral glans of the penis should be fixed; (2) semen should be avoided from contamination as far as possible; and (3) sperm should be prevented from being hit by low temperature.
Therefore, attention should be paid to the operation: the sperm collector should put on disinfection gloves and squat on the left side of the fake Taiwan pig. After the boar climbs across the platform pig, wash and disinfect the foreskin of the boar with 0.1% potassium permanganate solution and rinse with normal saline; then hold the hand into an empty fist and lead it into the empty fist at the same time as the boar's penis protrudes and let it pump and rotate for a while. With fingers from light to heavy with elastic rhythm to hold the spiral penis glans not to let it turn, with the full erection of the penis homeopathic stretch forward (not forced to pull), fingers elastic and rhythmic adjustment of pressure, boar ejaculation. The other hand holds a semen bottle with filtered gauze and heat preservation to collect sperm-rich semen. If the boar ejaculation stops, the pressure can be applied again according to the above method, that is, the 2nd or 3rd-4th ejaculation until complete ejaculation.
The tube grip method is made by shortening the false vagina and connecting it with a rubber funnel. it is a combination of false vagina and hand grip, and has the double advantages of false vagina and hand grip. During the operation, the semen collector holds the funnel part with his right hand to form a fist grip, close to the back of the Taizhu pig. When the penis extends into the false vagina and enters the funnel grip, semen is taken in the same way as the hand grip.
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