First, artificially maintain the sow's normal body condition. Before weaning piglets, care should be taken to ensure that sows after weaning reach a moderate sensation, not too thin or too fat. For sows with poor post-weaning sensibility, they should be fed with nutritious and high-quality feed, and appropriately increase the amount of feed (2 to 3 kg of feed per day), so that sows can be restored to sensation; and the sows that have become weaned after weaning should respond. It reduces the amount of concentrate feed, and feeds more green and juicy feed to promote its reduction.
Second, for sows that have reached the normal breeding condition and are not estrus, try the boars to chase the sows, or keep the boars and sows in one column, so as to stimulate the ovulation of the sows.
Third, increase the amount of sow exercise. For non-estrus sows, you can put outdoors in the sun on a sunny day, and drive the sow every day for half an hour, adhere to the day, from time to time, you can promote sows ovulation estrus.
Fourth, hormone aphrodisiac. Commonly used triple hormone (25 mg acetone testosterone per milliliter, progesterone 125 mg, 15 mg estradiol benzoate), an intramuscular injection of 2 ml, heat within 5 days of the rate of up to 92%. For sows with estrus disorders caused by endocrine disorders, triple hormone aphrodisiacs can also be tried.
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