Livestock experts generally believe that breeding herds must have established methods for eliminating sows, and that the proportion of sows in each parity must be kept stable. The ideal ratio of sows of 1 to 8 production is 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 of all, we must eliminate two consecutive sows with fewer births, but the first-time sows are too lightly weighted, overfeed during pregnancy, too much Weight Loss during lactation, and sows with poor weaning conditions should not be included.
Second, sows that are not estrus when treated with hormones should be eliminated. 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, they should be eliminated because the sows’ birth rate is generally below 50. %.
Second, we need to eliminate the sows that have already produced 6 litters to 7 litters. Because they have started to appear to have few live litters (mainly because of an increase in the number of stillbirths), their piglets are of uneven size, and the weaker piglets are susceptible to cold and illness, have more breasts, and are clumsy in their body and are prone to dying of their pigs. problem. 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, in spite of this, limb and foot disease still occurs, and sows are inevitably eliminated due to poor health.
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