When a gilt weighs 30 kg, the formulated feed per kilogram should contain 13 megajoules of digestive energy, containing 16% of crude protein, 0.8% of lysine, 0.75% of calcium, 0.65% of phosphorus, and free intake, not controlling the amount of feed. The gilt grows as soon as possible. Starting from a weight of 45 kg, the calcium and phosphorus levels in the diet increased by 0.1 percentage points. When the gilt is 5 months old and the body weight is around 85 kg, it is limited to feeding. Similarly, the daily feed intake is controlled at 2.3 kg to 2.8 kg depending on the body condition.
When the gilt is 8 months old and the body weight is 110 kg, the initial allocation is more appropriate. The first estrus period does not require breeding. At this time, the sow's ovarian function is not yet complete. Feeding aphrodisiac began two weeks before breeding, and the amount of feeding increased by 40% to 50%, reaching a daily feed of 3.8 kg to 4 kg of compound feed. Supplementary aphrodisiac can increase the amount of ovulation, and the number of litters per litter can increase by two. Immediately after the end of breeding, the amount of feed was reduced to the level before the aphrodisiac supplement of about 2.2 kg per day. The diet contained 12.1 MJ of digestive energy per kilogram, containing 14% of crude protein, 0.75% of lysine, and 0.8% of calcium. Phosphorus 0.65%, daily feeding volume 3.25 kg ~ 3.5 kg. 2 days to 3 days before delivery, the daily feeding amount is reduced to about 1.8 kg to prevent dystocia.
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