Heifers are generally exposed to heat for the first time from 6 to 12 months of age. At this time, the duration of estrus is short and the cycle is not normal. The reproductive system and its function are still in the stage of growth and development, and it is not suitable for breeding calves. Males and females have had fertility at sexual maturity of 8 to 12 months of age, but at this time the body is in a vigorous stage of growth and development. If mating, it will affect their growth and development and breeding in the future. The useful life will be shortened and the offspring's vitality and production performance will be low. Therefore, it is not appropriate to breed at this time, and care should be taken in production to avoid random distribution.
So how old is the cow to start breeding? It depends on its maturity. Males and females generally grow at 2 to 3 years of age and reach the maturation period when they can breed. According to the experience, the first-rate females are generally 1.5 to 2 years old and the male cattle are 2 to 2.5 years old. The introduction of male and female cows 1.5 to 2 years old is appropriate. Specifically, the individual's growth and development status should be determined. Adult cows should be used as the standard. When the individual's weight reaches 65% to 70% of adults, up to 90% of the body, and 80% of the chest circumference, the initial matching age is appropriate. it is good.
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