After the cows got pregnant, early embryonic death was an important cause of the low reproduction rate. In response to this phenomenon, good results can be obtained if 1-3 injections of vitamin A (and the other two vitamins) or vitamin E are injected on the day after the cow is fertilized. There are three specific ways:
1. Cows were injected with 500,000 IU vitamin A on the day of fertilization and 5-6 days after fertilization. As a result of this, the rate of fertility of the first fertilized cow after calving was 19.9% ​​higher than that of the non-injected cow; even if the first fertilization was not matched, there were another 70 in the non-matched experimental group. % More than 18-25 days after re-estrus, only 35% of non-injected cows did not return to heat at this time. It can be seen that the injection of vitamin A preparation can not only improve the fecundity of the cow, but also has a good effect on the subsequent sexual cycle.
2. Vitamin E (250 mg each) was injected once at 2, 6, and 12 days after fertilization. The fertility rate for the first fertilization was 6.8%-10.51% higher than that of non-injected cows.
3. Injecting vitamin E (500 mg) once 15 to 20 minutes after fertilization allowed the fertility rate of the first fertilized cows to increase by 14.4% compared to non-injected cows.
If you compare the effect of the above three injection methods, the number one and the second are better, but no matter which method is much stronger than the non-injector. These methods are simple and easy to use, and the source of the preparation is not difficult. It has a certain use value.
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