The gilts and barrows have a faster growth rate, a higher feed conversion rate, and a higher carcass leanness rate at the same weight. The gilts use the same amount of lysine as castrated boars of the same weight while consuming less feed. However, castrated boars consume about 100G of feed per day (35-55KG stage), so if the lysine requirement is expressed as a percentage of the same diet, the boar's diet needs to contain 0.83% of lysine, and The gilt diet should contain 0.87% lysine. Therefore, if the nutritional needs of the gilt are met, the boar's nutrition will be excessive; if the boar's nutritional needs are met, the gilt's Nutrition will be insufficient. The nutritional needs of pigs of different genders differ greatly after 25 KG, because in practice, it is advisable to group by sex when not later than when they are out of bed, so as to avoid stress reactions when they are mixed. If the conditions for conservation are better, it is more desirable to group by sex when weaning. Split sex management is good for improving the homogeneity of listed pigs. Taking into account the fact that the actual operation of the breed is relatively simple, the medium-sized and large-sized pigs can be fed after 25 kg body weight, and the time for re-feeding the gilts can be delayed by 7 to 15 days. .
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