1. Rich vitamins \ x0d \ x0d \ Vitamins in reserve pig feed must be supplied according to the requirements of breeding pigs. Adequate vitamins can promote the development of reproductive organs, normal estrus, increase ovulation and improve pregnancy rate. Roche Multidimensional or BASF Multidimensional is recommended. In addition, according to the needs, make up for the shortcomings and make up for the shortcomings. \x0d\\x0d\ 2。 Adequate calcium and phosphorus \ x0d \ \ x0d \ The bones of pigs with high lean meat develop late, so it is necessary to provide diets with high calcium and phosphorus levels to increase mineral deposition from the late development stage to the breeding stage of sows. The requirements of calcium and phosphorus should be supplemented according to the requirements of breeding pigs, so that reserve pigs can have strong limbs. When phytase is added to feed, the available phosphorus, calcium and calcium should not be less than 0.36%, 0.75% and 0.7% respectively. \ x0d \ x0d \ 3。 Supplementing organic chromium, selenium, cobalt \ x0d \ x0d \ organic chromium can promote the growth of pigs, improve the carcass quality of pigs, and effectively improve the immune level and anti-stress ability of the body: the main function of selenium is to increase the litter size, reduce the mortality of piglets before and after weaning, increase the milk yield of sows and improve the immune ability; Cobalt is the main element of VB 12 synthesis in pigs, and it is generally not lacking, so it is generally not added in feed, but cobalt supplementation in boars can improve reproductive ability. \x0d\\x0d\ 4。 Balanced and rich amino acids and high energy \ x0d \ \ x0d \ Modern breeding pigs are lean meat breeds, which need high energy and rich and balanced amino acids to meet the needs of reserve growth and development and lay the foundation for future reproduction.