Cows are not estrus

About two months after the cow reached sexual maturity, the cow did not have obvious estrus symptoms for the following reasons:
Infertility of heterosexual twins: The main reason for this happening is that during pregnancy, the fetal membrane arteries between the male and female baboons have anastomosis branches, which hinders the development of female reproductive organs. The clitoris of the new mother-in-law is relatively large and the vagina is relatively short.
Quiet estrus: The estrus performance is very weak or the performance is short-lived, and it often occurs during the night heat, or the estrus is not obvious during the estrus. However, sometimes it was discovered after estrus that it was neglected because of the cause of the breeder.

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