Correctly grasp cattle's insemination method
1. Semen quality: The quality of bull semen is mainly reflected in the strength of the sperm, and the fertilization ability of strong sperm can be maintained for a long time. It is a prerequisite for promoting insemination and improving the conception rate, so it is necessary to maintain the breed of bulls. Good individuals, sperm motility after thawing of frozen semen used for insemination should not be less than 0.3.
2. Reproductive function: The normal ovulation physiology of cow estrus affects the production of eggs and the discharge of egg movement, fertilization, and embryonic development. If the cow has good sensation and is of a moderate age, the estrus is normal and strong, which is beneficial to the conception of frozen semen.
3, insemination technology: artificial insemination personnel must master the artificial insemination technology, cleaning, disinfection, mining, semen processing, insemination and other rings are closely linked, a deduction, any one link is not good may cause loss The adverse consequences of matching or infertility.
4. Insemination time: Choosing the most suitable time for insemination can ensure that sperm and eggs with strong living ability meet in the fertilized part and increase the fertility rate. Insomnia is too early, sperm loss of fertilization or death, can not fertilize the egg; insemination is too late, even if the sperm fertilization ability, the egg discharge time is too long, the egg can not be fertilized by aging. The fertilization capacity of the female steak eggs is 20-24 hours. The sperm fertilization capacity in the cow's reproductive tract is 28-50 hours. Generally, the insemination rate of the early cow estrus is low, and it is most appropriate to inseminate 12 hours after estrus or 8 hours before ovulation. .
5, abnormal estrus identification: some cows in the production of a quiet estrus or estrus during pregnancy (dystic), so must go through a rectal examination to understand the development of follicles, to grasp the rules of estrus and ovulation, early pregnancy diagnosis, to ensure that abortion And the normal development of the fetus.
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