This study was conducted to investigate the effects of dietary leucine and glutamate on growth performance, carcass traits and meat quality of finishing pigs.Sixty Duroc×Large White×Landrace pigs with about77 kg of average body weight were randomly assigned to 5 groups with 12 pigs per group (half male and half female).The pigs in the control group were fed the basal diet, and others in the experiment groups were fed the basal diet supplemented with 2.05％ L-alanine (iso-nitrogenous control group), 1.00％ leucine+1.37％ Lalanine (leucine group), 1.00 ％ glutamate + 1.44％ L-alanine (glutamate group) and 1.00％ leucine + 1.00％glutamate (leucine+glutamate group), respectively.The experiment lasted for 60 days.The results showed that compared with the control group, the average daily feed intake during 1 to 30 days, final body weight and back fat thickness of pigs in glutamate group were significantly decreased (P < 0.05), and the average daily gain during 31 to 60 days was decreased by 22.5％ (P>0.05);the intramuscular fat content in Longissimus dorsi muscle and Biceps femoris muscle of pigs in leucine group and leucine+glutamate group was significantly increased (P<0.05), and the average day gain during 1 to 30 days was increased by 8.04％ but that during 31 to60 days was decreased by 23.70％ (P>0.05).Compared with the iso-nitrogenous control group, the cooking rate, drip loss and meat color in leucine group and glutamate group had no significant difference (P>0.05),while the meat yellowness value in leucine+glutamate group was significantly decreased (P<0.05), the contents of flavor amino acids in Longissimus dorsi muscle and Biceps femoris muscle had no significant difference among all experiment groups (P>0.05).These findings suggest that diet supplemented with 1.00％ leucine can decrease the ratio of feed to gain during 1 to 30 days and increase the content of intramuscular fat in Longissimus dorsi muscle;diet supplemented with 1.00％ glutamate or 1.00％ leucine+1.00％ glutamate can increase the average daily gain during 1 to 30 days and decrease the average daily gain during 31 to 60 days;diet supplemented with 1.00％ leucine+1.00％ glutamate can decrease the meat color yellowness value, improve intramuscular fat content and meat quality of finishing pigs.[Chinese Journal of Animal Nutrition, 2017, 29 (2) :
国家科技期刊平台
NSTL
维普
万方数据
