摘要
Abstract
This trial was conducted to study the effects of different levels of coated methionine on growth performance , blood biochemical indices and apparent ileal digestibility of amino acids in broilers. A total of 3 780 Cobb 500 broilers aged 18 days were randomly arranged into 7 groups with 3 replicates per group and 180 broilers per replicate. Control group received a basal diet supplemented with 0. 16% Z)L-methionine, trial groups received the basal diets supplemented with 0.32% (B) , 0. 29 % (C) , 0. 26 % ( D) , 0. 22 % (E), 0.19% (F) and 0.16% (G) of coated methionine, and broilers were fed to the 42 days of age. The results showed that final weight, average daily gain and average daily feed intake of groups B and C were higher than those of the control group (P < 0. 05) , and the mortality of group B was lower than that of the control group (P <0. 05) , but there was no significant difference in all above indices between the other groups and the control group (P >0. 05). Plasma GSH-Px activity of trial groups (except group G) was higher than that of the control group (P < 0. 05) , and SOD activity of groups B and C were higher than that of group G (P < 0. 05) , but there were no significant differences in other blood biochemical indices among all groups (P > 0. 05). There were no significant differences in apparent ileal digestibility of dry matter and crude protein between trial groups and the control group (P >0. 05) , and the apparent ileal digestibility of amino acids of trial groups was increased (P < 0. 05) or no change expect that the apparent ileal digestibility of many kinds of amino acids of group G was decreased compared with the control group (P < 0. 05). These results indicate that growth performance and apparent ileal digestibility of amino acids in broilers are increased with the supplementation of coated methionine increasing, but the supplementation of 0. 19% coated methionine can meet the needs of broilers, namely, coated methionine can be substituted for 60% DL-methionine in the diet, so DL-methionine can be saved up to 40 % .
关键词
包被蛋氨酸/肉鸡/生长性能/血液生化指标/养分表观回肠消化率Key words
coated methionine/ broilers/ growth performance/ blood biochemical indices/ nutrient apparent ileal digestibility分类
农业科技
