What to do when replacement gilts do not come into heat? Practical methods to promote estrus

    Replacement gilts are usually kept in small pens in groups (4 to 8 per pen), and from 5.5 months of age they begin fence-line contact with boars. Gilts should be exercised regularly, and they should be moved between pens and the boars in adjacent pens rotated (preferably once a week). It is best to use high-quality feed (rich in vitamin E, vitamin A, vitamin D, choline, and necessary trace elements and amino acids, etc.), with short-term supplementary feeding, combined with changing the feed to stimulate estrus.