The best timing of breeding is determined by the time of ovulation and the length of time the sperm can enter the sow. Sow Ovulation Time: Standing estrus starts 26~46 hours, 95% of eggs are discharged at the same time; Survival time after ovulation: no more than 6 hours; Survival time of boar sperm discharged: 18 to 24 hours; sperm capacitation requires 6 ~8 hours; the vigor continues for 12 hours after the sperm enters the uterus. 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 mating of sows in folk slang: 1. The pus dipped in the grass and inseminated; 2. The stunned, insemanated and conceived child; 3. The standing does not move, and is suitable for breeding; 4. The thickening of mucus is exactly the heat.
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