Effects of Low-protein Amino Acid Balanced Diet Supplemented with Glutamate on Growth Performance,Blood Antioxidant and Immune Indicators of Weaned Piglets
This study was conducted to investigate the effects of highly reducing dietary crude protein level,balancing essential amino acids and supplementing glutamate on the growth performance,blood antioxidant and immune indicators of weaned piglets.144 healthy crossbred piglets(Duroc× Landrace × Large White)were select-ed and randomly divided into 3 treatments,6 replicates in each treatment and 8 piglets in each replicate.The exper-iment lasted for 16 days.Group Ⅰ was the control group,the dietary CP level was 21.16％;group Ⅱ was fed a low-protein diet with 15.97％dietary CP level,supplemented with essential amino acids(EAA)Lys,Met,Thr,Trp,Val and Ile as required;group Ⅲ was supplemented with glutamate(Glu)on the basis of group Ⅱ.The results showed that the ADG of weaned piglets in group Ⅱ was significantly lower than that in group Ⅰ and group Ⅲ(P＜0.05).The diarrhea rate of piglets in group Ⅱ was significantly lower than that in group Ⅰ(P＜0.05),that of groupⅢ was significantly lower than that of group Ⅱ(P＜0.05)and extremely lower than that of group Ⅱ(P＜0.01).The concentration of plasma total antioxidant capacity(T-AOC)in group Ⅲ was significantly higher than that in groupⅠ and group Ⅱ,respectively(P＜0.05).The concentration of plasma immunoglobulin A(IgA),immunoglobulin G(IgG),immunoglobulin M(IgM)and interleukin-10(IL-10)in group Ⅲ was significantly higher than those in group Ⅰ and group Ⅱ(P＜0.05),the concentration of plasma interleukin-10(IL-10)in group Ⅱ was significantly lower than that in group Ⅰ(P＜0.05).In conclusion,feeding low-protein diet supplemented with essential amino acids and glutamate after weaning could improve growth performance of weaned piglets,reduce diarrhea,enhance antioxidant and immune functions.
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