塞曼特罗(cimaterol)对肉鸭生长后期肌肉增长和体脂代谢的影响

Effects of Cimaterol on Muscle Proliferation and Lipocatabolism at Later Stage in Duck

在３种不同日粮中分别添加０．５ｍｇ／ｋｇ、２．５ｍｇ／ｋｇ和５．０ｍｇ／ｋｇβ－受体激动剂——塞曼特罗（ｃｉ－ｍａｔｅｒｏｌ），饲喂３０～５０日龄的肉鸭，结果显示：３种不同剂量的塞曼特罗在３种日粮条件下均可促进肌肉增长；剂量达到５．０ｍｇ／ｋｇ时，不但刺激鸭胸大肌快速生长，而且能增强腿部肌肉生长，血清磷酸肌酸激酶活性也相应升高。鸭生长后期用塞曼特罗可明显抑制脂肪在体内的沉积，但日粮中能量不可过高，否则会掩盖塞曼特罗的功效。脂肪代谢过程中血糖升高和血清高密度脂蛋－胆固醇降低，表明脂肪分解作用可能加强。

Three diets of different nutrient composition were supplemented with 3 concentrations (05,25 and 50 mg/kg)of βadrenergic agonist cimaterol,respectively,and fed to ducks during 30～50 days of age ,thus forming 3 treatments.Ducks fed on the same diet without cimaterol were used as controls.Muscle proliferation was found in ducks of all the 3 treatments.Feeding on diet 3 with 50 mg/kg cimaterol enabled ducks to grow breast and also leg muscles more rapidly and to have a higher level of creating phosphokinase in serum compared with control ducks.At later stage cimaterol can inhibit fat deposition in duck significantly.But when the metabolic energy in diet was over 116 MJ/kg,efficiency of cimaterol decreased.The increase of the glucose and the decrease of highdensity lipoprotein cholesterol levels in serum may indicate the increase of fat decomposition.