Timely breeding is the key to improving conception rate and litter size. The basic basis is based on the ovulation law of sows. Whether it is a cross or artificial insemination, sow breeding must accurately grasp several key times:
1 gilt puberty 3-6 months of age; sow estrus time of 27-32 days; sows estrus cycle 21 (16-24) days; sow estrus duration 5 (2-7) days; Sows estrus to ovulation 24-36 hours;
2. The ovulation process of sows is gradual, the duration of ovulation is 5 (4-7) hours, the time of egg maintenance fertilization is 8-10 hours, and the number of ovulation is 15-25.
3. The time for the sperm to reach the fallopian tube is 2 (1-3) hours; the spermatozoa live in the fallopian tube for 10-20 hours.
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