1. The sow's dietary intake for the first month before delivery is about 10% higher than usual.
2. In winter, sows need to consume a portion of their energy to maintain body temperature. Attention should be given to trimming poorly insulated pig houses. The amount of diet fed should be greater, with the exception of overweight sows.
3. When juvenile sows are mated, their monthly age is often the criterion, but the weight of young sows should also be taken into account. Some young sows, although they reach the age of one month, have too little weight, and the birth weight of piglets born will be too small.
4. Young sows before mating should avoid over-restricted feeding to prevent significant lag in development. In addition, the group of young sows are susceptible to bullying in the group, resulting in insufficient feeding of weak pigs and adjustments must be made.
5. Taking into account the nurturing ability and continuum after delivery, the weight of the sows at the time of their first mating should be at least 120 kg.
6. From the genetic point of view, we should find out a major new family. If the litters are in good order and the piglets produced are of a new generation, the birth weight of piglets produced by each sow is relatively large.
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