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1. Observing the estrus of beef cattle Observing the duration of estrus in beef cattle is short. About 18 hours, 25% of the estruss of beef estrus do not exceed 8 hours, and there are more estruss in the afternoon and the morning before the next morning than in the daytime. 65%) From 18am to 6pm, it is particularly concentrated between 2pm and 3am, with the most frequent climbs. About 80% of meat steak eggs 7-14 h after the termination of estrus, 20% of beef bred early or late ovulation. According to reports, leaky cows can reach about 20%, the main reason is that the identification of heat signs is not correct, and 5-7% of pregnant cows will show estrus. 2. Timely insemination A certain amount of high-quality semen is delivered to the appropriate site in the uterus of estrus, which is very important to improve the conception rate of beef cattle. Cows usually ovulate after the end of their estrus, and their lifespan is 6-lOh. Therefore, the best breeding time for cows during estrus should be 6-7 hours before ovulation. In the actual production, when the mother meat estrus can be inseminated in the following circumstances, 1 beef cattle from the uneasiness to stability, that is, the estrus performance began to weaken; 2 genital swelling began to disappear, the cervix slightly contraction, mucosa from pink to pink Or with purple cyan; 3 mucus volume from more to less and become turbid; 4 follicle volume is no longer increased, the skin becomes thin and elastic, bubble fluid fluctuations, a touch is broken feeling. 3. Note that beef nutrition strengthens the nutrient supply of beef cattle, especially for high-meat cattle (eg dairy cows) during pregnancy. Provide cattle with a balanced, comprehensive, and appropriate amount of various nutrients to meet the needs of cattle maintenance and fetal growth and development. For cattle in the puberty period, attention should be paid to the supply of protein, vitamins, and minerals to meet their sexual function and body development needs. However, excessively high levels of nutrition can often lead to abnormalities in bull libido and cow estrus. It is important to ensure that the body condition of the breeding cattle is not overweight or emaciated. Green fodder supply is important for non-grazing young cattle. High-quality green fodder or pasture should be supplied to male cows before and after puberty. 4. Improve the effect of insemination In addition to timely insemination, the uterus can be purified while inseminated to increase the conception rate. The method uses 1 million IU of erythromycin before and after mating with a cow, 40 ml of distilled water, and is diluted for purification of the uterus. Neostigmine sulfate injection can also be applied. In the 8-12 h before the start of the uterus injection, 10 mg of neostigmine sulfate is injected into the uterus and a mixture of 800,000 IU of penicillin and 30-50 ml of physiological saline is injected.