What should be done if a sow has not come into heat for more than 90 days after giving birth to one litter?
What should be done if a sow has still not come into heat for more than 90 days after giving birth to one litter?
The problem of primiparous sows not coming into heat after weaning, delayed estrus, and low litter size after mating is a difficult issue encountered by the global pig industry. The current solution is to inject 1000 units of pregnant mare serum gonadotropin into the sow on the day of weaning to regulate the endocrine system. Its improvement effect is relatively obvious.
Of course, some other causes of this problem must also be considered: breeding stock factors, that is, whether the Landrace-Yorkshire crossbred sow is truly a Landrace-Yorkshire crossbred sow? Feed factors, whether hormone-type growth-promoting drugs have been added to the feed? Or drugs for treating eperythrozoonosis have been added? As well as management factors, etc.
Of course, some other causes of this problem must also be considered: breeding stock factors, that is, whether the Landrace-Yorkshire crossbred sow is truly a Landrace-Yorkshire crossbred sow? Feed factors, whether hormone-type growth-promoting drugs have been added to the feed? Or drugs for treating eperythrozoonosis have been added? As well as management factors, etc.