Low-protein Diet Supplemented With Amino Acids On The Growth Performance And Meat Quality Index In Growing-finishing Pigs

The objective of this study was to research the effects of amino acids supplementation of a low-CP,corn-wheat-soybean meal-based pig diet on growth performance、nitrogen nutrient digestibility、carcass traits、serum biochemical indexes and meat quality index of growing-finishing pigs.Experiment 1: Piglets were at 30kg and allocated to 7 treatments with four replicates of each treatment and ten growing pigs per replicate according to birth date, litter, and gender, using complete random single factorial design. The results showed that: (1) Compared with the control group,pigs fed dietⅤ-Ⅶhad increased the ADG significantly(P﹤0.01)and pig fed dietⅥhad the best ADG and ADFI(P﹤0.05)among the groups;pigs fed dietⅡ-Ⅶhad lower F/G(P﹤0.01)and F/G in treat groupⅦwas the lowest;(2)There had no significiant difference on the feed digestive ratio of DM、Ca and P among the groups (P>0.05)in which treat groupⅢ-Ⅶhad increased the feed digestive ratio of CP significiantly ( P﹤0.05);(3)Compared with control group,pigs fed dietⅥhad higher content of total protein in serum(P>0.05); pigs fed dietⅡ-Ⅶhad decreased serum BUN significantly(P<0.05)and pigs fed dietⅢandⅣhad lowest serum BUN among the treat groups;pigs fed dietⅥandⅦhad increased IgG content significantly(P<0.05);treat groups can got similar Serum amino acids content with additions of crystalline amino acids (P>0.05)Experiment 2: Piglets were at 60kg and allocated to 7 treatments with four replicates of each treatment and ten growing pigs per replicate according to birth date, litter, and gender, using complete random single factorial design. The results showed that: (1) Compared with the control group,pigs fed dietⅢandⅥhad higher ADG and ADFI(P﹤0.05)among the groups; pigs fed dietⅥhad lowest F/G(P﹤0.05)among the groups;(2)there had no significiant differences on the feed digestive ratio of DM、Ca and P among the groups (P>0.05);therefore, pigs fed dietⅡ-Ⅶhad higher feed digestive ratio of CP(P﹤0.05);(3)Compared with control group,pigs fed dietⅥandⅦhad higher content of total protein in serum(P>0.05); pigs fed diet Ⅳ、Ⅵ、Ⅶhad higher serum globulin(P﹤0.05);pigs fed dietⅡ-Ⅶhad decreased serum BUN significantly(P<0.05);pigs fed dietⅢ,Ⅵ,Ⅶhad higher IgG content(P>0.05);treat groups can got similar Serum amino acids content with additions of crystalline amino acids (P>0.05);(4) Pigs fed the low-protein diet supplemented with AAs had no differences compared to the control group on dressing percent and average backfat.Therefore,pigs fed dietⅥandⅦincreased LMA significantly;(5)There was no difference on pork quality among all groups(P>0.05)...