After the cow undergoes rapid and dramatic changes in pregnancy, childbirth, and reproductive organs, the genitals of the cow have a process of recovery, and the time for the first estrus after birth is inconsistent.
In order to promptly breed the postpartum cows and shorten the calving interval, it is necessary to pay attention to the first occurrence of heat after the cows are born. After the cow undergoes rapid and dramatic changes in pregnancy, childbirth, and reproductive organs, the genitals of the cow have a process of recovery, and the time for the first estrus after birth is inconsistent. Under the conditions of suitable temperature, no post-partum disease, and good husbandry and management, the time for the first occurrence of heat after birth is shorter. Generally in the postpartum 40-45 days heat, and some 25-30 days after the start of the first heat. The first estrus time after delivery starts, usually within the range of 20-70 days. If the estrus has not been detected 60 to 90 days after delivery, the cow's health, nutritional status, ovaries and uterus should be examined and treated to prevent airborne and infertility. Some cattle are postpartum due to physical weakness, or a large amount of lactation, resulting in ovulation without obvious estrus symptoms of estrus, especially in high-yield cattle, some cattle up to 45%. For cows that are in rut without estrus, ovarian follicular development should be enhanced.
In order to reach a cow's annual birth, it must be conceived within 85 days after birth. During the 20 days after childbirth, a small number of cows returning to estrus and breeding are only 25% fertile. The average fertility rate after mating in 40-60 days is 50%. The fertility rate after maturing in 60 days or more is stable at about 60%. . The introduction of post-harvest early mating, while increasing the consumption of semen, is more assured for shorter production intervals and can increase productivity. It is generally believed that estrus in the 40-50 days after childbirth is most suitable for breeding.
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