Correctly grasp the insemination method of cattle

The factors that determine the conception rate of cows are: semen quality of breeding bull, estrus and ovulation function of cows, operation quality of artificial insemination, insemination time and so on.

1. Semen quality: the semen quality of the bull is mainly reflected in the motility of the sperm. the fertilization ability of the sperm with strong motility can be maintained for a long time, which is a prerequisite for promoting insemination and improving the conception rate. therefore, it is necessary to keep the breed of bull good, and the sperm motility of frozen semen used for insemination should not be less than 0.3 after thawing.

2. Reproductive function: whether the physiological function of oestrus and ovulation of cows is normal or not affects the egg production and ovulation movement, fertilization and embryonic development. If the cow is in good body, moderate age, normal estrus and exuberant, it is beneficial to the conception of frozen semen.

3, insemination technology: artificial insemination personnel must master artificial insemination technology, cleaning, disinfection, semen collection, semen treatment, insemination and other links are closely linked, link by link, any link poor mastery may lead to the adverse consequences of mismatch or infertility.

4. Insemination time: choose the most suitable time for insemination in order to ensure that the viable sperm and eggs meet at the fertilization site and improve the conception rate. Insemination time is too early, sperm lose fertilization ability or death, can not fertilize the egg; insemination time is too late, even if the sperm fertilization ability is strong, the egg excretion time is too long, the egg aging can not be fertilized. The fertilization ability of cows is 20-24 hours after ovulation, and the fertilization ability of sperm in the reproductive tract of cows is 28-50 hours. Generally, the insemination rate of cows is low at early estrus, and it is the most suitable for insemination 12 hours after estrus or 8 hours before ovulation.

5. identification of abnormal estrus: some cattle have quiet estrus or false estrus during pregnancy (false estrus), so rectal examination must be conducted to understand the development of follicles, master the law of estrus and ovulation, and diagnose early pregnancy. to ensure the normal development of conception and fetus. Wang Shanqiang