While strengthening the feeding and management of pregnant cows and fully satisfying the nutritional needs, the timely injection of vitamin A and vitamin E to pregnant cows can increase the vitality of pregnant embryos in the womb, promote the development of embryos and fetuses, and increase the reproductive rate. It is also an effective way to reduce early embryonic death in dairy cows.
First, the injection of 500,000 international units of vitamin A to pregnant cows on the day of fertilization and 5 days to 6 days after fertilization will increase the fertility rate of fertilized cows by 19.5%. Even if the first fertilization was unsuccessful, over 80% of the cows that were not fertilized successfully returned to heat after 18 to 25 days, compared with only 30% of unvaccinated cows that did not receive vitamin A injections. The cow relapsed during this period. It can be seen that injecting vitamin A into pregnant cows can not only improve and increase the reproductive rate of dairy cows, but also have a good effect on the subsequent sexual cycle.
2. Vitamin E (250 mg each) was injected once on the 2nd, 6th, and 12th day after fertilization, respectively, and the first fertilization rate was higher than that of non-injected cows.
10.5%.
3. Injecting vitamin E (500 mg) once 15 to 20 minutes after fertilization of the cows will increase the fertility rate of the first fertilized cow by 14.5%. In addition to vitamin E, it can be used to regulate sexual function and increase reproduction rate. It can also be used to treat diseases such as habitual abortion, threatened abortion and infertility. It can also reduce the excitability of the uterus of pregnant cows and protect the safe growth of the ovum.
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