The best timing of breeding is determined by the time of ovulation and the length of time the sperm can enter the sow.
Sows ovulation time: Standing estrus starts 26 to 46 hours, 95% of eggs are discharged at the same time;
Survival time after egg excretion: no more than 6 hours;
Survival time of boar sperm excretion: 18-24 hours; sperm capacitation requires 6-8 hours; sperm enters the uterus for 12 hours.
Check the sows' estrus twice a day: 9am and 5pm. The estrus in the morning and the breeding in the afternoon are 6 to 7 hours. The sperm survival time is 18 hours, which is about 25 hours. After 12 hours of breeding again. 6/7+12+18=36/37, basically including the ovulation process.
The best time for sows to ovulate and breed is: once a day, estrus is a match; twice a day, postponed half-day breeding; four times a day, and breeding after 24 hours.
Two breedings: gilts 12 hours apart and sows spaced 24 hours apart.
The vivid summary of the timing of estrus and breeding of sows in folk slang:
Impregnating the grass with the pussy, insemination is just fine;
Look in a daze, insemination and abortion;
Stand still, just match;
The thickening of mucus is exactly the heat.
1. If the sow returns to her condition within 18 days after mating (18 to 19), it means that the breeding is too late.
2. If the sow returned to her condition 22 days after mating (23 to 24), the mating is too early.
3, if the return within 21,22,23 days after mating, indicating that the breeding fails, need to check the quality of semen.
4. If you return to love within 39-45 days after mating, it means that you missed the last estrus cycle and you need to check the method of detection.
5, if the return within 25 to 38 days after mating, outside the normal range. The sow is pregnant but cannot conceive because of: 1) Stress. 2) Moldy feed. 3) There are too few eggs for pregnancy. 4) Uterine infection.
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