(A) The amount of crude fiber should not be too high. The crude fiber for growing and finishing pigs is 3-4%. Raw materials with low crude fiber content should be used, and raw materials with high crude fiber content, such as rice sugar and rice, should not be used excessively. (b) Protein levels must be guaranteed. The proportion of protein in lean-type pigs' body tissues is high. The level of the daily sperm protein should be 17.5% in the 15-30kg weight stage, 16.5% in the 30-60kg stage, and 15.0% in the 60kg heavy stage. In addition, it is often necessary to add 0.10-0.15% of amino acids and 0.05-0.08% of methionine. (3) Nutritional balance is very important. Large-scale pig farms have high stocking densities and lack of sunlight and green feed. Many natural trace components cannot be obtained on their own, and lean pigs have a daily gain of more than 800 grams. Therefore, it is necessary to add various additives in the diet. It is worth noting that some ingredients with very few additions, such as sodium selenite, olaquindox, etc., can cause pig poisoning when added in excessive quantities, and it is difficult to mix evenly with artificial incorporation.

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