Most traditional pig farmers in our country use "hanging shelves", that is, a large amount of green feed and roughage feed in the early stage, and less input of concentrate feed. When the pig grows to 50-60 kilograms, a large amount of high-energy concentrate feed is quickly added to fat. Although this breeding method utilizes a large amount of green and roughage, the protein and mineral elements required for the normal growth of pigs can not be satisfied. Therefore, the feeding time is too long, and it usually takes one year or more, and the rearing and consumption are maintained. Too much, not only does not save the fine feed, but it causes serious waste of concentrate. However, a small number of specialized pig farmers adopt the “one-stop†feeding method, which means that pigs have been fed with condiments from pigs to slaughters without any green or rough feed. Although this method has greatly shortened the number of feeding days and reduced the maintenance expenditure, a large amount of green and roughage in rural areas has not been fully utilized, and economic efficiency is still not satisfactory. Adopting the "pump-feeding method" to raise pigs can save 30% and 10% of concentrate feed, respectively, compared with "hanging shelves" and "through-training" feeding methods. The "pump-feeding method" has a high lean meat ratio among pigs and is highly favored by consumers. The specific practice of "pour-feeding" pigs: In the pig-to-middle pig stage, that is, 50-60 kilograms before, high-energy, high-protein concentrates are used, with the necessary feed additives, only a small amount of green feed is fed, not Feed any roughage. Pigs from the stage of 50-60 kg to the slaughter stage, appropriate to reduce the energy and protein levels in coarse materials, reduce the input of fine material, increase the input of green and rough feed, the ratio is: 62% concentrate feed, green feed 26 %, roughage accounted for 12%. The scientific basis for the “pour-feed method†for raising pigs is that the pig-to-middle pig stage is dominated by long bones and lean meat, and there is a greater demand for protein and mineral elements. In addition, the pig’s digestion and utilization of fiber is extremely low. Only by focusing on concentrates to meet the needs of pigs for protein and various mineral elements can pigs grow quickly to 50-60 kilograms, reducing unnecessary consumption.
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