Most cows simultaneously estrus ovulation method In the beef cattle production process, in order to facilitate the production management and marketing, so that beef cattle can uniform specifications, unified standards for the same period of fattening, at the same time slaughter, therefore, the use of simultaneous estrus law, so that the cow estrus estrus at the same period, To achieve the same period of mating, production at the same time, the same period of childbirth, the same period of fattening, slaughter cattle at the same time production purposes. At present, the method of inhibiting estrus and dissolving the corpus luteum is mainly adopted to enable cows to achieve ovulation during the same period.

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.

Cows are prolific cows and are singleton animals. Under natural conditions, the twins rate of cattle is 0.29%-3.5%. Therefore, in order to make cows prolific, increase the efficiency of cow breeding, and reduce the cost of farming, 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 is a method in which the embryos are transplanted in the two uterine horns of cows 6 days to 7 days after the estrus of the cows. In addition, artificial insemination combined with embryo transfer method is used to make cows produce more fleas, that is, in the 6 days to 7 days after cows are estrous mated, double embryos are transplanted inside the uterus to achieve the purpose of twins.

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