Foreign experts generally believe that: breeding herds should have a method of eliminating the sows to be settled, and the proportion of sows in each parity should be kept stable, and the ideal ratio of 1 to 8 parity sows should be approximately 17%, 16%, and 15 respectively. %, 14%, 13%, 12%, 10% and less than 4%. If there are enough unbred gilts, several general principles must be followed to decide whether to eliminate certain sows at weaning.

First, we must eliminate two consecutive sows that produce fewer litters, but the first-time sows are too lightly weighted, excessive feeding during pregnancy, too much weight loss during lactation, and poorly weaned boars should not be included.

Secondly, we should eliminate sows that are not estrus when they are even treated with hormones. Sows should be observed for up to 18 days after weaning and 7 days after hormone treatment. If these sows do not fit into the next estrus period, they should be eliminated because the sows’ birth rate is generally lower 50%.

Again, we must eliminate the sows that have already produced 6-7 litters. Because they have started to appear, the problem is usually that there are few litters (mainly because of an increase in the number of stillbirths), that the piglets are of uneven size, that weaker piglets are cold and sick, that there are more breasts and the body is clumsy and easily pressed Dead piglets and so on. In order to reduce the problem of movement disorders, attention should be paid to the condition of the extremities when selecting or purchasing sows, and the use of high-quality flooring in the pens should not raise the weight of the sows. However, despite the fact that limb and foot disease still occurs, sows are inevitably eliminated due to poor health status and infectious vaginitis.

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