Re-breeding measures after failed mating of cows. The reasons for repeated infertility of cows should be found out in time. B-ultrasound for cows should be used as much as possible for diagnosis and symptomatic treatment, and re-breeding measures should be taken according to different individuals.

In actual work, there are roughly three reasons for repeated infertility of cows: one is improper feeding and management of cows. Some are due to over-nutrition, which makes the cows too fat, causing the reproductive tract (such as fallopian tubes, cervix, etc.) to be blocked by fat. Although the estrus is normal or the estrus is vigorous, the conception rate is low or repeated infertility is due to poor nutrition. If the cow fat deposition is found to be serious when using B-ultrasound for cows, it is necessary to deal with it in time. cattle B-ultrasound

makes the cows too thin, resulting in no estrus or quiet estrus, which the breeder cannot observe and causes the cows to be empty for a long time. Second, some diseases are obstetric diseases such as vaginitis, oophoritis, salpingitis, endometritis, cervicitis, etc., which cause infertility. Obstetric diseases detected by B-ultrasound for cows are very important. Some are infectious diseases such as brucellosis that cause miscarriage or repeated infertility: the third is congenital infertility. After being confirmed by B-ultrasound examination, farmers should be guided to fatten and eliminate such cows in time.

Good breeds and good methods. In actual work, only good breeds, without good feeding and management methods, cannot maximize the benefits of frozen beef cattle. Therefore, in the work of frozen beef cattle, it is necessary to guide farmers to do a good job in epidemic prevention, increase the promotion of grass-growing cattle and comprehensive supporting technologies for cattle breeding, and guide farmers to carry out scientific breeding. Only in this way can the maximum benefits of frozen beef cattle be brought into play.

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