Cow estrus ovulation breeds generally in autumn and spring. It is the key to improving the conception rate of the cows to grasp the breeding time and do a good job of breeding at the right time. Then, when is the best breeding time?
When the cow is in estrus, the libido and external performance are generally obvious. The estrus period can be divided into three periods.
In the early stages of estrus: The cows are excited, yelling, walking, and loss of appetite. The labia was swollen and the tailed bull did not accept the climb. Open examination showed that the cervix was slightly open, the amount of mucus was small, and there was resistance to insertion into the open chamber. This period generally lasts 15 hours.
During the estrus period, the cows walked less and accepted the bulls to climb. Open examination, significantly increased mucus, a large number of vaginal congestion, open the device without resistance. During the rectal examination, the ovary slightly increased on one side, and the mating desire was strong. This period generally lasts 15 hours.
At the end of the estrus the cows gradually became calm and when the bulls climbed, the cows turned to avoid but rarely ran. Opening examination, reduced mucus, cervical closure. During rectal examination, the follicles increased. This period generally lasts 13 hours.
The practice of mating proves that the mating rate of the cows in the early stage of estrus is about 5%; the mating rate of the estrus is high, the fertility rate is about 50%; the mating rate at the end of the estrus is 70% to 80%. This shows that the end of the estrus of cows is the best period for breeding.
In order to accurately determine the optimal timing of breeding, the method should be: if the morning cows are found to be stable and do not move immediately after the bulls are caught, do not postpone breeding immediately. To postpone the evening or early morning of the next morning, if the cows are found in the afternoon If you do not move in a stable manner, you should postpone until early the next morning or late in the evening. In the morning and evening, the environment is quiet, the cow's cerebral cortex is in a suppressed state, and the excitement of the reproductive system is relatively enhanced, ovulation is fast, and the rate of pregnancy is high. To be more confident, the breeding can be repeated once every 10 hours.
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