Most traditional pig farmers in China use "hanging shelves." Although this breeding method utilizes a large amount of green and roughage, the feeding time is too long because the protein and mineral elements required for the normal growth of the pig in the early stage cannot be satisfied. There are also people who adopt "one-stop" feeding methods, that is, they are fed with condiments from piglets to slaughter. Although this method greatly shortens the number of feeding days and reduces the maintenance cost, the cost of feed is high. 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" pig rearing: In the pig-to-middle pig stage, that is, 50 to 60 kg before, high-energy, high-protein concentrates are used, and the necessary feed additives are used to feed only a small amount of green feed. Do not feed any roughage. Pigs from the 50-60 kg stage to the slaughter stage, appropriate to reduce the crude material in the energy and protein levels, reduce the input of fine material, increase the input of green, rough feed, the ratio is: concentrate feed is 62%, green feed accounted for 26%, roughage accounted for 12%.
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