To maintain a good lean type pig and increase the lean meat percentage, it is critical to grasp the following points.
Currently, the lean meat percentage of local pig breeds in China is only about 41%. After years of experiments, Nanjing Agricultural University screened the ternary crossbred pigs that were crossed by Duroc and Landrace and Erhualian, and the pigs weighing 90 kg were thin. Meat up to 49 kg, lean meat ratio of 54%.
Feed lean-type pigs require about 3,100 kcal per kilogram of digestive energy and weigh between 20 and 50 kilograms. The crude protein requirement is 16% and the weight is 60 to 90 kilograms. The sperm protein is only 14%, while lysine Acid, methionine, cystine and other important trace elements and vitamins should be added in a certain proportion.
In order to facilitate pig raising, the concentrates specifically produced by the feed mill can be used to add a certain proportion of corn, bran, rice bran, bean cake, etc. in accordance with the instructions, and be formulated into a full-price compound feed that meets the requirements without having to buy various trace elements and additive. If the concentrate can not be bought at one time, it can be formulated according to the following formula: 1. Pig weight 10 kg to 20 kg is: corn 60.2%, bran 4%, bean cake 28%, fish meal 4%, yeast powder 2%, salt 0.3 %, bone meal 0.5%, compound trace elements 0.5%, multivitamins 0.5%. 2. The weight of pigs is 21kg to 35kg: 63% corn, 10.2% bran, 13.5% bean cake, 6% rapeseed cake, 5% fishmeal, 0.3% salt, 1% bone meal, 0.5% compound trace elements, multivitamin 0.5%. 3. The weight of the pigs was 36 kg to 60 kg as follows: corn 62%, bran 12%, gluten 5%, soybean meal 10%, rapeseed cake 5%, fish meal 3.5%, salt 0.5%, bone meal 1%, composite trace elements 0.5 %, multivitamin 0.5%. 4. The weight of the pig is 61 kg to 90 kg: 57% corn, 18% bran, 6% bran, 9% soybean meal, 5% rapeseed cake, 3.3% yeast powder, 0.5% salt, 1% bone meal, compound trace elements 0.1%.
Breeding adopts the "open front and rear control" feeding technology. “Before open†means that pigs are fed or free-feeding several times a day before 50 kg of body weight, and the feed is not restricted; after 50 kg, except for ensuring sufficient drinking water, only two meals a day are provided. Meal is only fed 80% of the full, the so-called "post-control." Because after 50 kg of pork, fat is mainly deposited and grows faster. If it is fed too full, the pig will lose more fat and reduce lean meat.
Control experiments showed that when pigs weighed 40kg to 60kg, the daily growth of lean meat was 288g and fat was 280g; after 90kg, the daily long lean meat was only 120g, and the fat was 2 times that of lean meat. the above. Therefore, lean-type pigs must be controlled at 90 kg to 100 kg slaughter.
Currently, the lean meat percentage of local pig breeds in China is only about 41%. After years of experiments, Nanjing Agricultural University screened the ternary crossbred pigs that were crossed by Duroc and Landrace and Erhualian, and the pigs weighing 90 kg were thin. Meat up to 49 kg, lean meat ratio of 54%.
Feed lean-type pigs require about 3,100 kcal per kilogram of digestive energy and weigh between 20 and 50 kilograms. The crude protein requirement is 16% and the weight is 60 to 90 kilograms. The sperm protein is only 14%, while lysine Acid, methionine, cystine and other important trace elements and vitamins should be added in a certain proportion.
In order to facilitate pig raising, the concentrates specifically produced by the feed mill can be used to add a certain proportion of corn, bran, rice bran, bean cake, etc. in accordance with the instructions, and be formulated into a full-price compound feed that meets the requirements without having to buy various trace elements and additive. If the concentrate can not be bought at one time, it can be formulated according to the following formula: 1. Pig weight 10 kg to 20 kg is: corn 60.2%, bran 4%, bean cake 28%, fish meal 4%, yeast powder 2%, salt 0.3 %, bone meal 0.5%, compound trace elements 0.5%, multivitamins 0.5%. 2. The weight of pigs is 21kg to 35kg: 63% corn, 10.2% bran, 13.5% bean cake, 6% rapeseed cake, 5% fishmeal, 0.3% salt, 1% bone meal, 0.5% compound trace elements, multivitamin 0.5%. 3. The weight of the pigs was 36 kg to 60 kg as follows: corn 62%, bran 12%, gluten 5%, soybean meal 10%, rapeseed cake 5%, fish meal 3.5%, salt 0.5%, bone meal 1%, composite trace elements 0.5 %, multivitamin 0.5%. 4. The weight of the pig is 61 kg to 90 kg: 57% corn, 18% bran, 6% bran, 9% soybean meal, 5% rapeseed cake, 3.3% yeast powder, 0.5% salt, 1% bone meal, compound trace elements 0.1%.
Breeding adopts the "open front and rear control" feeding technology. “Before open†means that pigs are fed or free-feeding several times a day before 50 kg of body weight, and the feed is not restricted; after 50 kg, except for ensuring sufficient drinking water, only two meals a day are provided. Meal is only fed 80% of the full, the so-called "post-control." Because after 50 kg of pork, fat is mainly deposited and grows faster. If it is fed too full, the pig will lose more fat and reduce lean meat.
Control experiments showed that when pigs weighed 40kg to 60kg, the daily growth of lean meat was 288g and fat was 280g; after 90kg, the daily long lean meat was only 120g, and the fat was 2 times that of lean meat. the above. Therefore, lean-type pigs must be controlled at 90 kg to 100 kg slaughter.
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