Causes of sows not having estrus after weaning: First, the level of nutrition is not enough, especially the lack of vitamins and energy in the feed. Second, premature mating of sows, often lead to abnormal second child estrus. Third, the lack of boar stimulation Sow is too far away from the boar, weaning sow was not due to sexual stimulation, resulting in no estrus. 4. Temperature, light and lack of exercise When the ambient temperature exceeds 30 degrees in summer, the ovaries and estrus activity of sows are inhibited. Five, feed raw mildew on the normal estrus zoster most affected is zeotoxin, especially zearalenone. After sows consume feed containing this toxin, their normal endocrine function is disrupted, leading to abnormal estrus. Sixth, ovarian dysplasia Seventh, sows have reproductive disorder diseases such as swine fever, blue ear disease, pseudorabies, parvovirus, Japanese encephalitis virus and Eperythrozoon and other pathogenic factors will cause sow flu and other reproductive disorders. Measures to prevent sows from estrus after weaning To reduce the loss of sows during lactation, the key is to control the nutrient level and feed intake of the feeding material; appropriate reductions should be made 3 days before weaning; short-term optimal feeding should be performed before weaning to match, and the amount of feed should be 3 kg per day; After 10 days, those who are still estrus can be intramuscularly injected with 250 to 1,000 units of crude hormone of pregnant horse serum, 500 units of chorionic gonadotropin, and then chasing exercise with the boar on the same sports field. Generally, it can be 2 to 4 days. estrus.
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