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First, the lactation law of dairy cows in different lactation months In the same lactation period, the milk production of different lactation months often varies with their breed, individual, age and health status, and feeding management. Usually after calving, milk production rises gradually, peaks at the second or third lactation month, and then gradually declines. Second, lactation milk cows of different ages and parity cows' milk production varies with age and parity. Generally, the first-born cows have poor lactation capacity due to their immature body, and their milk yield is less than 80% to 85% of the milk production of the highest parity times. With age, parity, and body maturation, they are usually 3 4 The fetus can achieve high yields. Some cows can maintain high milk production from 7 to 8 children under good husbandry and management, but most cows begin to decline milk production at 5 to 6 fetuses. Third, the different milking time and milking interval cow milk lactation regular milking time will also affect the cow's milk production. Cows produce more milk during the night, and milk production in the morning is higher than other time, so the milking is better at 5-6 in the morning. Milking intervals also have a certain effect on milk production. Experiments have shown that the milking intervals are equal and there is more milk production, such as milking every 8 hours or milking every 12 hours. The domestic method of milking 3 times a day is usually used.