Tips for breeding first-born sows

First, nutrition regulation and control during the growing period. The sow (binary cross) starts from the weight of 30 kilograms, and the diet should contain 13 megajoules, 16% crude protein, 0.8% lysine, 0.75% calcium and 0.65% phosphorus per kilogram. Starting from the weight of 45 kg, increase the content of calcium and phosphorus by 0.1% each. The feed intake of 150-day-old sows was controlled when their body weight was about 80 kg, and the daily feed intake was 2.3 kg ~ 2.5 kg. The calculated weight of native sows should be less than 2 kg ~ 3 kg.

Second, aphrodisiac and tonic materials during the mating period. The first mating age of binary crossbred sows should be carried out at the age of 8 months with a body weight of 110 kg and that of native pigs at 70 kg. Since the sows began to be restricted to feed control at the age of 5 months, the diet was increased by 40% to 50% 14 days before breeding to 3.8 kg ~ 4 kg per day.

Third, moderate nutrition during pregnancy. Immediately after mating, the feeding amount should be reduced to the level before aphrodisiac feeding. The diet formula contains 12.1 megajoules of digestible energy, 13% crude protein, 0.60% lysine, 0.75% calcium and 0.65% phosphorus per kilogram of feed, about 2.2 kg per day until 84 days of pregnancy. Starting from 85 days of pregnancy, the diet was adjusted to 1251.3 joules per kilogram of digestible energy, 14% crude protein, 0.75% lysine, 0.8% calcium, 0.65% phosphorus, and 3.25kg ~ 3.5kg daily feed. To 3 days before delivery, the daily feeding volume was reduced to about 1.8 kg to facilitate smooth delivery.

Fourth, strengthen food intake during lactation. The sow should be gradually increased to the maximum feeding volume 5-7 days after giving birth. The method of estimating the dietary intake of sows during lactation is as follows: based on 1.5 kg diet, 0.5 kg feed is added for every piglet fed, if 10 piglets are fed, it is 6.5 kg feed. If the sow can not eat 6.5 kg of feed every day, 2%-4% edible oil can be added to the feed, and the nutritional level can reach 13 trillion ~ 13.8 trillion joules per kilogram of feed, 14% 16% of crude protein, 0.7% of lysine, 0.54% of calcium and 0.7 of phosphorus.