Sows estrus compounding is also called repeated breeding. The advantage of repeated breeding can make up for the time identification error between the first estrus and the ovulation period. At the same time, it can avoid the regurgitation caused by boar semen quality problems. The number of effective spermatozoa also increased the number of fertilized eggs from the perspective of breeding, and increased litter size. In the daily mating work, the compounding work has played a large role in raising the number of litters and the quasi-childbirth rate.
First, compound time
The estrus period of sows is generally 8 to 12 hours (initiation period), and the ovulation time is between 12 to 36 hours after estrus (ovulation period) and 36 to 48 hours during the off-season period. In addition to individual sows due to their own factors, the estrus period will be relatively extended, most of the sows are relatively normal estrus. If the mating is carried out in the early and early offspring, the quaternary birth rate and the number of litters will be greatly reduced. To ensure effective breeding, the first breeding can be carried out during the initial period of ovulation alternating with ovulation (ie, when the climb is accepted). The compounding is performed at intervals of 8 to 12 hours, and the third breeding is performed at intervals of 8 hours, or the second breeding is performed in the middle of ovulation.
Second, the compound mode
Complex with two breeding and three breeding points. The compounding method can also be divided into a variety of ways: first-time delivery + one-time insemination, or repeating this, or two inseminations, or three inseminations, or one-time infusion + insemination twice. Usually take the initial allocation in the morning, reconstitute in the afternoon, and then the third breeding in the morning the next day; also can be used in the early afternoon allocation, the next morning, recombination. General sows have a longer estrus period and can accept three repeated matings. The gilts (before 3 months of age) generally have a short estrus period, and it is good to grasp the quality of the two breedings. If the sow has an extended estrus period after the sow has been mated, an insemination or breeding can be added. After breeding, it should be as quiet as possible to focus the sow, which is beneficial to the ovulation of the sow and increase the number of fertilized eggs.
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