First, the cow's breed. It is better to choose Holstein cows, avoid buying yellow-breeded cows, and use frozen semen from Holstein dairy cows to mix with native yellow cattle and fake Holstein dairy cows.
Second, the appearance of dairy cows. Choose cows of moderate sympathy, well-proportioned structure, thin skin, fine head and neck, great eyes, wide chest, straight back, firm limbs, good breast attachment, and even nipple distribution.
Third, the production performance of dairy cows. In addition to estimating the performance of dairy cows from their body appearance and breast development, they can also refer to the milk production rate and milk fat percentage of dairy cows in their past fetuses, and the milk production and milk fat of their mothers, grandmothers and grandmothers. .
Fourth, the breeding ability of dairy cows. Adult cows need to know the age of their first birth, the calf interval between births, the birth date, the date of first birth, the date of the last breeding, and so on. For young cows to understand their initial mating age, date of mating, date of conception, number of breedings, etc. .
Fifth, the health status of dairy cows. First, we must determine whether the baby is healthy by observing the state of the cow's spirit, the state of lyrics, the appetite, and the degree of wetness of the nose. Second, we must look at the pedigree data in the dairy cow's disease records and previous quarantine, tuberculosis, brucellosis, etc., and prevent injections, anthrax, foot-and-mouth disease and other conditions. Third, we must understand if there is an epidemic of bovine infectious diseases in the local area. The focus is on tuberculosis, brucellosis, foot-and-mouth disease, and infectious tracheitis. Fourth, it depends on whether there is a recent quarantine certificate issued by the local veterinary authority.
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