First, why the sow does not have heat after weaning

1. The level of nutrition is not enough, especially vitamins and energy in the feed.

2. Premature sow mating early, often leads to abnormal second child estrus.

3. Insufficient stimulation of the boar, the sow is too far away from the boar, and the weaned sow is not given proper sexual stimulation, resulting in no estrus.

4. Temperature and light and lack of exercise. When the ambient temperature exceeds 30°C in the summer, the ovaries and estrus activity of sows are inhibited.

5. Feed raw materials moldy. Maize mycotoxins, especially zearalenone, have the greatest influence on normal estrus in sows. After sows consume feed containing this toxin, their normal endocrine function is disrupted, leading to abnormal estrus.

6. Ovarian dysplasia.

7. Sows have reproductive disorders. Pathogenic factors such as swine fever, blue ear disease, pseudorabies, parvovirus, Japanese encephalitis virus, and Eperythrozoon will cause soreness and other reproductive disorders in sows.

Second, the solution

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 250-1000 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, 2 to 4 days are available. estrus.

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