(1) The method of ovulation in most cows at the same time: At present, the scale of cattle breeding develops rapidly. In order to facilitate centralized management, it is best to ovulate most of the cows at the same time, and at the same time carry out mating and production. How can we achieve the above purpose? The method is: prepare a small piece of foam for each cow, soak it with medroxyprogesterone 250 mg, and then place the foam block on the outside of the cow's cervix for 14 to 16 days. Immediately after removing a small piece of foam, each cow was injected with 2000 units of maternal serum gonadotropin. After 2 to 3 days, the treated cows were all able to ovulate. At this time, it is necessary to seize the opportunity to breed: one is to inseminate once on the day of heat and the other on the second day; the second is to breed with a bull.
(b) to make the cow more prolific mother-in-law method: First, sunny day breeding. The breeding selection is from 10 a.m. to 2 p.m. in sunny days, allowing the cows to face the sun station for 30 minutes and then mating; the second is to feed arginine. 30 minutes before estrous cow mating, a small amount of 5% arginine solution is first introduced into the cow's uterus and then bred. Practice has proved that this method can make cows produce female pupa rate of more than 80%; third is to feed calcium-containing feed. During the first two months of pregnancy, the cow is fed a diet rich in calcium. The proportion of sodium and potassium contained in the egg is less than calcium and magnesium.
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