The reason why the sow is not estrus for a long time and the solution
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Uteritis or some infectious diseases: sows suffering from endometritis, erythroderma, mycoplasmosis, parvovirus, etc., can cause long-term estrus after sow weaning.
Malnutrition or mildew feed poisoning: Long-term lack of nutrition or nutritional imbalance in feed, or feeding moldy and degenerative feed, so that the pig's pituitary hormone secretion is inhibited, and the performance of long-term estrus.
Problems with feeding and management: Sows are kept in the same environment for a long time (such as in the positioning column) causing long-term estrus.
Second, the solution:
1. The cause of the disease should be removed first.
2, malnutrition or mildew feed should be strengthened nutrition, do not feed moldy mildew feed, while feeding in the feed VA, VE or carrots.
3, management measures.
Gravid gilts: Use sowing bar to increase sow breeding rates.
The specific procedure is: After the gilts reach the mating age, the sows will be rushed into the positioning bar, and the sows that have not been estrus after 30 days will be rushed into the large circle or raised in the playground (3 or more) for 2 to 3 days. , Let it fight (in order not to cause serious harm as the standard), and then drive back to the positioning bar for feeding, observe the estrus and breeding, every 10 days for a cycle, so repeated several times, the general total breeding rate of more than 85%.
Weaned sows: The key to promoting estrus in weaned sows is to sow the “breastfeed†status as soon as possible and enter the estrus state. In general, the sow is in a physiological transition period within three days after weaning. If a big bar or a game farm is used at this time, the sows will fight each other and change their feeding methods. They will soon forget to “breastfeed†and enter the estrus state. So weaning the sow for 2 to 3 days after weaning is a good way to promote the estrus of the sow. However, after the fourth day, some of the sows enter the estrus period. If they continue to feed in big pens at this time, observation errors will result. Therefore, weaned sows are bred in a herd for 2 to 3 days. From the fourth day, the sows are transferred to the positioning bar for observation, and the estrus and breeding are observed for 7 to 10 days. The estrus sows have not yet been transferred to the sports field or the large bar. 2 to 3 days, then into the positioning column so repeated several times, breeding rate of up to 85% or more, for sows with repeated infertility or sows with long estrus, can be injected after the first breeding One ovulation 3 (LHRH-A3), and then insemination.
Sows that have been bred are not allowed to be bred in groups so that the fertilized eggs cannot be implanted due to fighting or crawling between sows, or early abortions. Sows should be fed into the positioning column immediately after the breeding, sows Don't do any vaccine immunization within 30 days of pregnancy and don't feed mildew feed.
For sows that are still estrus after taking the above method, drugs can be used to induce estrus. Induction of estrus hormones: A. FSH pigs 10 to 25 mg once intramuscularly. B. pregnant horse serum: 200 ~ 800 units, an intramuscular injection. C. Human chorionic gonadotropin: 500 to 1000 units, one intramuscular injection. D. Prostaglandin: An intramuscular injection of 3-8 mg. E. Cloprostenol: 175 μg intramuscularly.