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The early death of the embryo after the cow is pregnant is an important reason for the low reproduction rate. If the cow is injected with 1-3 times of vitamin A or vitamin E after mating, good results can be obtained. First, 500,000 units of vitamin A were injected into the cow on the day of breeding and 5 to 6 days after breeding. 2. Vitamin E was injected once on the 2nd, 6th, and 12th days after mating. Each dose was 250 mg. 3. Vitamin E dosage is 500 mg once every 15 to 20 minutes after mating.