1, natural mating.
It is a common breeding method, which allows cows and bulls to mate independently without estrus identification. This is relatively easy to do. Relatively speaking, the fertilization rate is high.
2. Artificial assisted mating.
When the size difference between male and female cows is too large, it is necessary to assist the bull to breed artificially at this time.
3. Artificial fertilization.
Collect bull semen, examine it carefully, freeze and thaw it, and then import it into the reproductive tract of estrus cows. When semen is frozen, it should be kept at a speed of about 10 second, and attention should be paid to semen preservation.
The best breeding time for cattle:
About 80% cows' estrus peak lasts 15 ~ 18 hours, and ovulate after estrus 10 ~ 17 hours. Therefore, the suitable breeding time for dairy cows should be at or near the end of estrus.
According to experience, cows in estrus in the morning should be bred in the afternoon, and cows in estrus in the afternoon should be bred the next morning. Heifer should be bred early, and old cow should be bred late.