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. It is not suitable for breeding calves. Male cows have fertility during the sexual maturation period of 8 to 12 months, but at this time the body is in a vigorous stage of growth and development. If mating and conceiving, it will affect its growth and development and future breeding breeding, and will also shorten With years of use, the offspring's vitality and production performance are also low. Therefore, it is not appropriate to breed at this time, and care should be taken in production to avoid random distribution. The maternal ox has an initial age of 1.5 to 2 years, male cattle is 2 to 2.5 years old, and male cows imported from abroad are suitable for 1.5 to 2 years old. With adult cattle as the standard, when the individual's body weight reaches 65%-70% of adulthood, up to 90% of the body, and the chest circumference is 80%, the initial matching age is the best.
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