The reason why the sow does not have estrus is more complicated. The reasons are as follows: 1 mature and immature; 2 years old and aging; 3 genital diseases; 4 systemic diseases; 5 endocrine disorders; 6 nutrition, trace elements and vitamins Lack of; 7 environmental temperature is too low or too high, light is too weak and other stress factors. All of these can cause sows to lose their estrus. If the sow is not estrus for a long time, appropriate treatment measures should be taken for the reason that the sow is not estrus. 1 Strengthen feeding and management, properly increase concentrates, feed feed rich in inorganic salts and vitamins, increase exercise and improve feeding environment. 2 suffering from genital diseases, common in ovarian and uterus diseases caused by heat, should take the appropriate treatment for different diseases. 3 Induction of estrus, during the estranged period of the sow, the use of exogenous hormones to promote their estrus and breeding, shortening the reproductive cycle of sows. Among them, gonadotropins (such as aphrodisiac, intramuscular injection, 10 ml per pig) can cause ovulation in the estrous period of the sow. In addition, oestrogen injections to sows and the use of chorionic gonadotropin or maternal serum also allow ovulation of sows.
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