According to reports, we must first eliminate two consecutive sows with fewer litters, but the weight of first-time sows is too light, excessive feeding during pregnancy, excessive weight loss during lactation, poor weaning conditions and other sows should not be included. Secondly, we should eliminate sows that are not estrus when treated with hormones. Sows should be observed up to 18 days after weaning and 7 days after hormone treatment. If these sows do not fit into the next estrus, they should be eliminated. Again, it is necessary to eliminate the sows that have already produced 6 to 7 litters. Http://
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