The growth and development of lean pigs is significantly different from that of normal pigs. It requires a feed nutrient level of 18% to 20% of crude protein in early growth, 12552kJ per kilogram of heat energy, 16% of crude protein in the middle of growth, 12552kJ per kilogram of heat, and a percentage of crude protein in late growth stage. 14, the thermal energy is 12552kJ per kilogram. Accordingly, the feed formula of lean pigs should have the following two characteristics: First, the proportion of energy (cereal) feed is slightly larger. In the early stages of pig growth, yellow corn accounts for 63 percent of total feed, which is 3 percent higher than fat pig feed. Relatively speaking, the proportion of grass powder and bran is less. Second, the biscuits, fishmeal, and bone meal with higher protein content should be sufficient. For example, in the middle or late stages of lean pork growth, fishmeal still accounts for 3 to 4 percent of the feed, while fat pig feed does not need to be added during the same period.
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