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The reason why cows are not estrus
In the reproductive physiology of dairy cows, normal estrus and ovulation are the basis for maintaining normal fertility. Because there is no normal estrus (ovulation), other reproductive physiological activities of cows lose their significance. In dairy cow production, it is more common than estrus. Cows that are not estrus are affected by a variety of factors. The function of the ovaries is disturbed, the development of follicles is blocked, and the sex cycle is stopped. It makes it impossible for the cows to be bred in time, resulting in a decrease in the herding rate of the herds, which in turn reduces the reproduction rate of pastures and increases the interval between calving. Breeders who have no estrus symptoms and who have not been estrus for 60 days postpartum for reserve cows aged 14 months or older should be analyzed and examined in a timely manner, and should start from the improvement of feeding management and application of reproductive hormones to restore the cycle. 1. The clinical manifestations of dairy cows that are not estrus (1) When the reserve cow reaches sexual maturity, no estrus cycle occurs, or one or two estruss occur after reaching the sexual maturity age, and no estrus occurs for a long period thereafter. (2) Long-term estrus performance was not observed after delivery. (3) After the cows had estrus 1 to 2 times after delivery, they no longer had estrus after a long period of time. 2. Factors that cause non-estrus (1) Nutritional factors: Insufficient feed intake, poor quality, and negative nutritional balance often cause cows to lose weight. (2) Health factors of cattle: Cows suffer from other diseases such as metabolic disease, hoof disease and parasitic disease, and their physical fitness declines. (3) Uterine disorders: such as uterine empyema, degeneration, uterine fibroids, endometritis, etc., so that the endometrium can not release prostaglandins, the mechanism of body dissolution of the corpus luteum is caused by damage. (4) Endocrine and neuromodulatory disorders. (5) Poor management, lack of exercise, mating of cows, etc.