After the cows got pregnant, early embryonic death was an important cause of the low reproduction rate. For this phenomenon, if the cow is given one or three doses of vitamin A (and also two other vitamins) or vitamin E on the day after the cow is fertilized, good results can be obtained. There are three specific ways: 1. On the day of insemination and 5 to 6 days after insemination, the cows were injected with 500,000 international units of vitamin A. As a result, the fertility rate of the first insemination cow after calving was 19.9% ​​higher than that of the non-injected cow; even if the first insemination was not assigned, 70% of the non-matched test group cows More than 18 to 25 days later re-estrus, only 35% of the uninjected end-eating cows relapsed at this time. Visible, injection of vitamin A preparations, not only can improve the breeding of cows, but also has a good effect on the subsequent sexual cycle. 2. Vitamin E (250 mg each) was injected once 2 days, 6 days and 12 days after insemination. The fertility rate for the first insemination was 6.8 to 10.51% higher than that of non-injected cows. 3. Injecting vitamin E (dose 501 mg) 15 to 20 minutes after insemination allowed the fertility rate of the first insemination cow to increase by 14.4% compared to non-injected cows. If you compare the effects of the above three injection methods, the first and second are higher, but no matter which method is much stronger than the non-injector. The method is simple and easy to use, and the source of the preparation is not difficult and has a certain use value.
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