First, the maternal ovulation time after estrus. Oestrous ovulation usually occurs near the end of estrus. The estrus period of the horse lasts about 7 days on average. The short period is only 3 days and the longest sustainable period is 30 days. However, regardless of the length of estrus, ovulation occurs 1 to 2 days before estrus. The cow's estrus period is 18 hours and the ovulation time is about 12 to 15 hours after estrus. The estrus of sheep lasts 24 hours and ovulation is about 20 hours after estrus. Goat estrus is about 40 hours, and ovulation occurs 30 to 35 hours after estrus. The estrous period lasts 40-60 hours, and ovulation occurs about 36 hours after estrus.
Second, the operation of the egg. After the ovulation of the females, the eggs quickly enter the fallopian tubes. Most of them are fertilized in the fallopian tubes. The place of general fertilization is the bulge in the upper part of the fallopian tubes.
Third, the egg to maintain fertilization time. In general, the fertilization site is at the top of the fallopian tube. The time that the egg passes through the entire fallopian tube is usually about 4 days for cattle and horses, and about 3 days for pigs and sheep. However, the time taken to reach the upper 1/3 of the fallopian tube is short, with cattle, horses, and pigs being about 6 to 12 hours, and sheep being 5 to 6 hours.
Fourth, the operation of sperm. When males and females are mated, the semen of a sire is injected into the reproductive tract of the female, but the ejaculation site is very different among the various livestock. The semen of horses and donkeys is shot at the end of the vagina and enters the uterus through a relaxed cervical canal; cattle and sheep are shot at the cervix; pigs are injected directly into the uterus during a long mating process.
V. When the sperm arrived at the fertilization site. The time for the sperm to reach the female fallopian tube is very short. For 30 to 60 minutes for horses, 4 to 6 hours for cattle, 20 to 60 minutes for sheep, and 1.5 to 3 hours for pigs. The spermatozoon runs faster in the female reproductive tract just entering the growth period and slower in the old female reproductive tract.
6. The time for sperm to maintain fertilization. Under normal circumstances, the sperm of various comrades remain fully active and fecundity in the reproductive tract of the female livestock for more than 24 hours. Usually about 36 hours for horses, about 30 hours for cattle, about 36 hours for sheep, and about 30 hours for pigs.
VII. Pregnancy. The gestation periods of various livestock were as follows: donkey 1 year, horse 11 months, cattle 8 months and 10 days, sheep 5 months, pig 3 months and 24 days, donkeys and cubs 10 days shorter than donkeys, horses Huai Long has 10 days longer than Huai Ma.
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