In the production process of raising cows, cows want to make cows prolific mothers, and cows want to make cows prosperously. They use them for their own purposes. In addition to the creation of the cow's vaginal acid-alkali fluid environment during the cows' period, people have researched and developed the technique of cattle sex control. The cattle sex control technology is to artificially intervene or operate so that the cow can reproduce the desired sexual offspring according to people’s wishes. Biotechnology. This technology has played an important role in raising the economic benefits of cattle breeding.
Heifers are a singleton animal, and in the natural state, the twins rate of cattle is 0.29% to 3.5%. Therefore, in order to make cows prolific, increase the efficiency of cow breeding, and reduce breeding costs, people Artificial induced twins were used to make cows twins. At present, the main ways of artificially inducing cows to produce twins are: genetic selection method, exogenous hormone induction method and embryo transfer method. Embryo transfer method is superior to genetic selection method and exogenous hormone induction method. Embryo transplantation, which is the 6th to 7th day after estrus in cows, transplants one embryo in each of the two uterine horns of the cow. This is the best method people think of to obtain a twin. In addition, artificial insemination combined with embryo transfer method is also used to make cows prone to spasm, that is, after 6 days to 7 days after cows are estrously mated, double embryos are transplanted inside the womb to achieve the purpose of twins.
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