There are three breeding methods for cows: natural mating, artificial assisted mating and artificial insemination.
Natural mating is a primitive free breeding in the breeding or grazing of male cows, usually male cows ratio of 1:12 to 25. This method should pay attention to the kinship between the bull and the herd and prevent inbreeding.
Artificially assisted mating refers to the male cows being reared separately. When cows are found to be in heat, the cows and bulls are naturally mated. After mating, males and females are reared separately. Using this method should pay attention to strictly control the breeding times of breeding bulls. After the mating is over, use your hand to weigh one at the back of the cow to prevent the cow from bowing and causing semen backflow.
Artificial insemination is the use of artificial methods to take bull semen and then artificially inseminate the estrus cow. Artificial insemination can make full use of elite bulls, increase fertility rates, reduce disease transmission, and save costs.
The timing of timely breeding (insemination) can be grasped from three aspects: First, 12 to 18 hours after the beginning of the estrus of the cow, the implementation of "morning oestrous breeding in the morning and estrus in the afternoon the second morning breeding." Second, the cow's libido just disappeared to 5 hours after it disappeared. At this time, the estrus cows did not accept the climb. The performance was quiet. The vaginal mucus was thick, and the mucus was sucked with the index finger and thumb and stretched again for 7-8 times. The third is to perform rectal examination in the third phase of follicular development, ie follicular maturation, and to perform ovulation examination 10 to 12 hours after mating. If the follicles are still not broken and ovulate, they should be bred once more.
In the case of a normal estrus of the cow and a more accurate grasp of the ovulation time, a breeding match can be performed. For cows with long estrus duration, two (individual three) breedings may be performed at intervals of 8 to 12 hours.