First, the concept of the estrus cycle
1, pre-estrus, estrus, late estrus and intercourse (cold period);
2, generally 21 days (18-23 days);
3, estrus about 2-3 days, about 13-14 days of luteal phase, follicular phase of about 3-5 days.
Second, the ovulation duration of sows
The average ovulation duration of sows is 4, 5 hours and the length is 10-12 hours. The ovulation duration of sows is as short as 6 hours and as long as 20 hours.
Third, the ovulation start time of sows
The ovulation period is usually 16-48 hours after the start of estrus. Generally 24-36 hours after heat, it can be seen from the figure below that 4-7 days after weaning happens to be 24-36 hours after heat. The ovulation start time of sows is 14 hours after the beginning of estrus and 41 hours after the start of estrus.
Four, sperm survival time in the sow reproductive tract
Since the spermatozoa can live for a maximum of 42 hours in the sow's reproductive tract, sperm have only 25-30 hours of fertilization time. The spermatozoa live in the sow's reproductive tract for 20 hours.
Fifth, the egg has fertilization time
The egg has a fertilizing capacity of 8 to 10 hours and a maximum of 15 hours. The general egg has a fertilizing ability of 8 hours.
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