Methods for improving mating methods and mating of sows born
Because the ovulation of sows is carried out one after another, the duration is long, the time for maintaining fertilization is short, the estrus performance of the introduced variety is not obvious, and the time for the beginning of estrus is difficult to grasp. Therefore, repeated mating and double mating are adopted in production practice. The method to increase the conception rate and the number of litters.
1 . Duplicate mating abbreviation for compounding. It is during one estrus period that the same boar is mated twice. The first mating is usually done after the sow has received a boar cross and the second mating is done 8-12 hours apart. This method can ensure that there is always a combination of vitality and sperm that is continuously discharged. Not only does the conception rate increase, the number of litters can also increase.
2 . Double mating involves using two boars of different breeds or two boars of the same breed in one estrus period, and mate each time 5 to 10 minutes apart. Because mating promotes ovulation, double mating also has a significant effect on improving conception rates and litter size.
In order to increase the conception rate and the number of litters, two inseminations or mixed inseminations can also be used. Breeding farms generally should not use double mating or mixed insemination, breeding pigs for local breeders can be properly adopted.
Matters needing attention
1 . Mating sites should be located in a quiet, flat place away from the barn. When mating, the sows are rushed to the place where they are mated, and then they are rushed to the scheduled boar.
2 . The timing of the mating should be performed before the early feeding and before the late feeding, to avoid the hot noon and after maturation.
3 . Artificial assistance When the boar crosses the sow, the sow's tail should be turned to one side so that the penis can be smoothly inserted into the vulva. The young boars who participated in breeding for the first time had a strong sexual desire. They often had multiple cross-overs and could not insert the penis into the vagina, and the male and female pigs consumed a lot of energy. Even if the sow could not support it, the breeding failed. Therefore, artificial assisted mating of young boars is particularly important.
4 . The physique of the male and female sows should be commensurate with that of the male sows. When mating occurs, two situations occur: either the boar does not easily cross the sow or the sow cannot bear the weight of the boar, resulting in difficulty in mating. success. The remedy is to choose a slope when mating, for example if the boar is smaller than the sow individual and let the boar stand high; otherwise, keep the boar standing low.
5. When the male and female pigs are separated and one mating is completed in time, the male and female pigs are quickly isolated to prevent the same boar from repeatedly mating and using in a short time. Keep sows as quiet as possible after mating.
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