Most traditional pig farmers in China use “hanging shelvesâ€, that is, large amounts of green and roughage are used in the early stage, and less input of concentrate feed is used. When the pig grows to 50-60 kilograms, a large number of high-energy concentrate feeds are rapidly fattened. Although this kind of feed utilizes a large amount of green and roughage, the protein and mineral elements required for normal growth in the early growth stage of the pig cannot be satisfied, so 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 concentrated feed in rural areas has not been fully utilized, so the economic efficiency is still not satisfactory. Adopting the "pump-feeding method" to raise pigs saves 30% and 10% of concentrate feed, respectively, compared to "hanging shelves" and "one-stop" feeding methods. The "pump-feeding method" has a higher lean meat ratio and is favored by consumers. The specific practice of "pour-feed method" for raising pigs: Before the pig-to-middle pig stage, that is, 50-60 kilograms, use high-energy, high-protein concentrates, supplemented with necessary feed additives, and feed only a small amount of green feed. To feed any roughage, the pig should grow to 50-60 kg until the slaughter stage, properly reduce the energy and protein levels in the coarse material, reduce the amount of concentrate input, and increase the input of green and rough feeds. The ratio is: 62% for concentrate feed, Green feed accounts for 26% and roughage accounts for 16%. 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 and meeting the needs of pigs for protein and various mineral elements can pigs grow up to 50-60 kilograms and reduce unnecessary consumption. When the pig grows to 50-60 kilograms, the meat grows. As fat lean meat goes hand in hand. China Agricultural Network Editor
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