Relevant experts believe that in order to increase the lean meat percentage of pigs, we must grasp four key issues, namely, “species, materials, support, and control.†Species—refers to better pig breeds. The breeds of pigs in China can be divided into three categories. One category is local pig breeds, such as Taihu pigs and Huai pigs. These pigs have a low lean meat, only about 40%; Pigs, such as Yorkshire pigs, Landrace pigs, Duroc pigs, etc. These pigs have a high lean meat percentage of about 58 to 65%; a class of hybrid pigs can be divided into two-way hybrid pigs and three-way hybrid pigs. . Binary hybrid pigs refer to the hybrid pigs that use the local pig breed as the parent and the foreign pig breed as the parent. The weight of 90 kg per head of the hybrid pigs can produce 34.65 kg of lean meat. The mothers of the two-way hybrid pigs were left to mate with foreign pigs. The pigs born were called three-way hybrid pigs, and the three-way hybrid pigs with a weight of 90 kilograms each produced about 38.88 kilograms of lean meat. To increase lean meat percentage, it is necessary to promote the use of dual- and triple-bred hybrid pigs. After years of experiments, Nanjing Agricultural University has screened out the “Durac Changbai Erhualian†three-way hybrid pigs, each of which has a weight of 90 kilograms and can produce about 39 kilograms of lean meat. Material - lean meat pigs are best to use compound feed, that is, corn, bean cake, bran, rice sugar, stone powder, additives and other feeds in accordance with a certain ratio. The lean meat type pig's feed requires approximately 3,100 kcal per kilogram of digestible energy. In the stage of 20-25 kilograms of body weight, the crude protein requirement is 16%, the 60-90 kilogram stage, the crude protein requirement is 14%, and some major The ratio of amino acids such as tyrosine, methionine, cystine, etc., and the main trace elements and vitamins must be a certain proportion. In order to make it easier for farmers to raise pigs, “agricultural shrinkageâ€, which is specially produced by feed mills or veterinary drug factories, can be formulated to meet the requirements of full-price batch materials by adding a certain percentage of corn, bran, rice bran, bean cake, etc., in accordance with the instructions. Have to buy a variety of trace element additives. Raising - refers to the breeding technology to increase the lean meat of pigs, must adopt the "open before and after the control" of the breeding technology, that is, 50 kg weight before the hog, open to feed, feed should not be limited. After weighing 50 kilograms, it is necessary to control the amount of feed, and generally only feed 80% to 90% full. Feed two meals a day and ensure that you have enough water. Because, after 60 kg of pigs, the fat grows faster, and if it is fed too full, the pig will grow more fat. Control - refers to the control of slaughter weight is generally 90 ~ 100 kg can be sold. Tests have shown that pigs grow 288 grams of lean meat and 280 grams of fat per day for body weights of 40 to 60 kilograms. After 90 kilograms, they have 120 grams of lean meat per day, and long fat is more than twice as long as lean meat. Therefore, lean pigs should not be raised too much.
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