Technical points of artificial insemination in pigs

 

Artificial insemination of pig is a technical measure of modern pig raising and an advanced mating method. Using this advanced technology, not only can make full use of excellent boars, accelerate the improvement of pig herd, but also can greatly reduce the number of breeding boars, reduce the cost of pig production, and effectively control the infectious diseases caused by direct mating of male and female pigs. In order to improve the conception rate of artificial insemination, the following steps should be done well

 

1. Semen collection

 

What should be paid attention to in semen collection: first, before semen collection, boars must be trained to climb across the semen collecting frame to establish a stable conditioned reflex to the false sows; second, all instruments that may be in contact with semen must be washed and fully disinfected. Third, after semen collection, the semen collected should be sent to the semen examination room quickly, and the semen quality should be checked at the temperature of 20-30 ℃.

 

2. Semen quality examination

 

The collected semen should be filtered first to remove the unusable protein clots and other substances in semen. Then, the color, odor, sperm activity, density, ejaculation volume, acrosome integrity rate, deformity rate and temperature resistance were measured. All indexes met the requirements, and the fresh semen vitality should be above 0.6.

 

3. Dilution of semen

 

Semen dilution should pay attention to the following points: first, the temperature of the diluent is consistent with the temperature of the newly collected semen. Therefore, 20-30 ℃ diluent should be prepared before each semen collection. Second, the diluent should be slowly poured into the semen along the wall of the cup and slowly shaken. Third, diluted semen requires 100-300 million sperm per milliliter.

 

4. Preservation and transportation of semen

 

The sperm density per ml of semen for preservation should not be less than 150 million, and the sperm motility should not be less than 0.8. During the transportation of semen, violent oscillation and excessive temperature change should be prevented. If the semen stored at low temperature is transported, the transport box should be filled with ice. The transportation of semen stored at room temperature should also maintain a low and fixed temperature. It is better to transport semen in a constant temperature transport box.

 

5. Insemination

 

Insemination is the last technical link of artificial insemination, and it is also an important link for sows to obtain a higher conception rate. Therefore, we must pay attention to the following points: first, strictly disinfect all insemination instruments; second, the vitality of the semen transfused is above 0.5 level; third, use 0.1% potassium permanganate solution to clean the vulva of sows, so as to avoid reproductive tract diseases caused by insemination; fourth, start in sows After 24 hours of oestrus climax, the effective number of sperms should be 1-2 billion. After 8-12 hours interval, the sperm should be infused again. Fifthly, do not force the sperm into the uterus, but slowly push it into the uterus along the upper wall to avoid entering the bladder.