First, the disinfection awareness is not strong Many dairy cattle households believe that cattle disease resistance, do not have strict disinfection, the result is often the death of the cow. Second, eager to achieve a lot of dairy cows in the yak is not born 18 months of age, weighing only 250 kg when the mating, resulting in the first child often dystocia, rupture of the vagina, secondary endometritis, affect the next Normal breeding of the fetus. Third, excessive milking Some dairy cows from the post-natal milk cows have been squeezed to stop milking when there is no milk, the results of dairy cows excessive consumption of nutrients, affecting the increase in milk production. IV. Dry milk reduction Many dairy cows mistakenly believe that cows should be fed less when they are not milking, so drastically reduce the amount of fine feed, resulting in cows showing inferior lyrical conditions before labor, and calving time-consuming, weak yak physique Cows have low milk production. Fifth, the system of raising piles The majority of dairy cows raise their cows with ropes and necks regardless of the four seasons. Never allowing cows to exercise, not only limits the activities of calves, but also seriously hinders the growth of calves and causes cows to grow. Dystocia, no placenta, no obvious estrus, poor health and other adverse reactions. Sixth, do not brush the cow body Many dairy cows are not accustomed to brushing the body with a brush or a comb every day. As everyone knows, dairy cow skin metabolism is obvious, sensitive to the outside dust, when the hair is accompanied by dry faeces, cows feel uncomfortable, commonly used tongue and tongue, with the body smashing walls, grooves and other methods to lift the body's itching, seriously affecting the health of dairy cows. China Agricultural Network Editor