The initial age of beef cattle should be determined according to the breed of cattle and its specific growth and development conditions, generally later than the sexual maturity. The initial weight of the beef cattle should be about 70% of its adult weight. When the age has been reached but the body weight has not yet been reached, the initial match age should be postponed; on the contrary, it can be appropriately advanced. The average age of general beef cattle is: early maturing varieties, bulls 15-18 months of age, cows 16-18 months; late maturing varieties, bulls 18-20 months, cows 18-22 months.
First, with the age of male, cows reached sexual maturity, although the reproductive organs have been fully developed, with a normal reproductive capacity, but at this time the body's growth and development has not been completed, it is not yet suitable for breeding.
Second, the useful life Beef cattle reproductive capacity has a certain number of years, the length of the year due to breed, feeding and management and the health status of cattle are different. The service life of beef cattle is 9-11 years, and that of bulls is 5-6 years. Over the reproductive years, male and female reproductive capacity will be reduced, there will be no feeding value, and should be eliminated in time.
The premature mating of male and female cows will affect their own health and growth. The yak produced is of weak constitution, small birth weight, and difficult to raise. The cow's postpartum milk production is affected, the bull's sexual function declines earlier, and the useful lifespan is shortened. . If the breeding is too late, the cows will be too fat, and the bulls will not be susceptible to masturbation and impotence, which will affect the breeding effect. Therefore, it is of great significance to correctly grasp the initial age of males and females, and to improve the quality of herds, give full play to their production performance and increase the reproductive rate.
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