A: 1 It is not properly managed. The nutrition in the feed is not balanced, and the lack of minerals or vitamins can lead to a disorder in the estrus cycle of cows or a lack of heat for a long time. In the absence of selenium in the feed, the reproduction rate of the cows declines, and it is easy to cause the tires to become unrepaired. The lack of cobalt can cause the cows to lose weight, Failure and basal metabolic rate decline, thereby reducing the production performance of cows; the proportion of concentrate in the feed is too high, coupled with insufficient activity of the cow, it is easy to cause the cow to be over-fat, and is not easy to heat.
2 disease. Including brucellosis, bovine contagious nasal bronchitis, bovine mucositis, bovine salmonellosis.
3 Breeding technical errors. Technical inaccuracies such as artificial insemination, embryo transfer, and midwifery cause contamination of the cow's reproductive tract, leading to reproductive disorders in cows.
4 prevention measures. Everyday should ensure that the cow's nutrition should be balanced; keep the cowshed ventilated, cool, not too crowded; artificial insemination, the operation should be strict, insemination operation is gentle, do not damage the reproductive tract, semen to ensure no pollution; childbirth, strict The delivery room, utensils, and cow's vulva are sterilized, and uterine cleansing and drug infusion are performed after the yak is produced or after the placenta is discharged to prevent infection.
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