In the practice of pig production, if there are fewer boars, and the estrus sows need to be planted in time, especially in some large pig farms, the sows are simultaneously estrus, and no artificial insemination is carried out. A continuous breeding of boars is a method that can be taken. The method is based on the characteristics of multiple breeding ejaculation in a boar breeding, and is introduced as follows:
The number of times of boar individual ejaculation varies greatly, some 1-2 times, 3 times, 4 times, and some as many as 6 times. The number of consecutive breeding sows is determined according to the number of boar ejaculations.
Sows are given 1 time every day from 5-6 pm or 16-17 pm (depending on the season, the breeding time varies slightly) and reconstituted 24 hours later.
The number of sows that are planned to be bred with a certain boar will be circled to the breeding site, and then the boar will be rushed to the first sow (combined first, after initial matching). See the boar steady start ejaculation, manifested as anal sphincter twitching or a little testicle on one side, ejaculation ended. These performances stopped and the second sow was quickly rushed to the side of the boar. In the absence of affecting the stability of the boar, the first sow was taken off and the front sow was smashed. Pigs, boars can jump the second sow. The entire process is not allowed to drive boars. In turn, the same method is followed by the third, fourth...
At present, the statistics are produced in 3 years and 6 years, and the boars are continuously matched with 56 sows, including 2 heads and 21 heads in a row, with an average litter of 12.6 heads; 3 heads and 18 heads in a row, with an average litter of 11.9 heads; With 6 heads and 3 heads, the average litter is 11.8 heads. Control: 11.97 heads were born according to the conventional mating seedlings.
Note: This method can not be compared with the artificial insemination of pigs. It is difficult for a boar to continuously jump pigs. It is impossible to complete the requirements of the breeding program 100%. It is only an emergency expedient.
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