To maintain a good lean type pig and increase lean meat percentage, we must focus on the following: 1. Pig breed: At present, the lean meat percentage of local pig breeds in China is only about 41%. After years of experiments, Nanjing Agricultural University screened out The three-way crossbred pigs that were crossed by Locke and Changbai and Erhuayu, a 90-kilogram pig, had a lean meat of about 49 kilograms and a lean meat percentage of more than 54%. Second, feed: lean-type pigs per kilogram of digestible energy requirements around 3100 kcal, body weight in the 20-50 kg stage, crude protein requirements in 16%, weight 60-90 kg stage, only 14% of protein, and Lai Amino acid, methionine, cystine and other important trace elements and vitamins must be in a certain proportion. In order to facilitate pig raising, the “concentrate†specifically produced by the feed mill can be used to produce a full-price compound feed that meets the requirements by adding a certain percentage of corn, bran, rice bran, bean cake, etc. in accordance with the instructions. Trace elements and additives. If you can not buy "concentrate", can be formulated according to the following formula: 1. Pig weight 10-20 kg: 60.2% corn, wheat bran 4%, soybean meal 28%, 4% fish meal, 2% yeast powder, salt 0.3%, bone meal 0.5%, composite trace element 0.5%, multivitamin 0.5%. 2. The weight of pigs is 21-35 kg: 63% of corn, 10.2% of bran, 13.5% of bean cake, 6% of rapeseed cake, 5% of fish meal, 0.3% of salt, 1% of bone meal, 0.5% of compound trace elements, multivitamin 0.5%. 3. Pig weight 36-60 kg: 62% corn, 12% bran, gluten 5%, 10% soybean meal, rapeseed cake 5%, 3.5% fish meal, salt 0.5%, bone meal 1%, composite trace elements 0.5 %, multivitamin 0.5%. 4. The weight of pigs is 61-90 kg: corn 57%, bran 18%, gluten 6%, soybean meal 9%, rapeseed cake 5%, yeast powder 3.3%, salt 0.5%, bone meal 1%, compound trace elements 0.1%. Third, rearing: Adopt the "open before and after control" breeding technology. "Before open" means that pigs take multiple feeds or free feed each day before 50 kilograms of body weight, and the feed does not impose restrictions. After 50 kilograms of weight, only two meals a day are provided except for guaranteeing adequate drinking water. Feeding only 80% of fullness per meal is the so-called "post-control." Because after 50 kilograms of pigs, fat is mainly deposited and growth is accelerated. If the pigs are fed too full, the pigs will grow more fat and reduce lean meat. Fourth, regulation and control: Tests have shown that pigs weighing 40-60 kilograms, the daily growth of lean meat is 288 grams, 280 grams of fat; and after 90 kilograms, only 120 grams per day of long lean meat, and fat is lean 2 times more. Therefore, lean-type pigs must be controlled in the 90-100 kg slaughter market.
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