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The ADG and ADFI of pigs in low level MT group are similar to the control, but the feed to gain ratio (F/G) reduces significantly by 5.85% (P0.05). 低MT组日增重和采食量与对照组没有显著差异,但饲料转化率显著提高,料肉比(F/G)较对照组下降了5·85%(P0·05)。