二甲基甘氨酸钠对肉鸡生产性能、养分表观利用率及内源消化酶活性的影响

Effects of N,N-dimethylglycine sodium salt on growth performance,nutrient apparent availability and digestive enzyme activities of broilers

[目的]测定饲喂不同剂量二甲基甘氨酸钠（DMG-Na）肉鸡的生产性能、养分表观利用率及内源消化酶活性,确定其在肉鸡生产上的最适添加剂量。[方法]试验选用1日龄AA肉鸡720羽,随机分成6组,每组6个重复,对照组饲喂基础日粮,5个试验组在基础日粮中分别添加300、500、1 000、1 500和2 000 mg·kg^-1二甲基甘氨酸钠,饲喂42 d。[结果]添加1 000、1 500和2 000 mg·kg^-1的二甲基甘氨酸钠可极显著降低肉鸡前期料肉比（P〈0.01）,但后期各组平均日增体质量、平均日采食量和料肉比变化不显著;试验全期,1 000和1 500 mg·kg^-1的二甲基甘氨酸钠组平均日增体质量显著高于对照组（P〈0.05）,料肉比极显著地低于对照组（P〈0.01）;与对照组相比,日粮中添加1 000、1 500和2 000 mg·kg^-1的二甲基甘氨酸钠能显著提高42日龄肉鸡对粗蛋白的表观利用率（P〈0.05）,但干物质、代谢能和粗脂肪的利用率变化不显著;添加500和1 000 mg·kg^-1的二甲基甘氨酸钠可以显著提高脂肪酶的活性（P〈0.05）,添加1 500和2 000 mg·kg^-1的二甲基甘氨酸钠则能有效提高胰腺组织中胰蛋白酶活性（P〈0.05）。[结论]日粮添加1 000~1 500 mg·kg^-1的二甲基甘氨酸钠能提高肉鸡表观利用率和内源消化酶活性,并能显著改善肉鸡的生产性能。

[Objectives]The study was conducted to determine the best dosage of N,N-dimethylglycine sodium salt（ DMG-Na） in broiler production by evaluating the growth performance,nutrient apparent availability and digestive enzyme activities of broilers.[Methods]Total 720 AA broilers of 1 day-old were randomly allocated to six groups with 6 replicates,and fed commercial starter diet which was supplemented with N,N-dimethylglycine sodium salt 300,500,1 000,1 500 and 2 000 mg·kg^-1respectively for 42 days.[Results]Adding N,N-dimethylglycine sodium salt supplementation of 1 000 and 1 500 mg·kg^-1decreased feed gain ratio of the early period significantly（ P0.01）,but the daily weight gain,daily feed intake and feed gain ratio of later period had no significant change; During the whole experiment,the average daily gain of the group 1 000 and 1 500 mg kg^-1was higher than control group（ P0.05）,the meat gain ratio was lower than control group extremely（ P〈0. 01）; The group 1 000- 1 500 mg·kg^-1displayed the best production performance. Feeding with N,N-dimethylglycine sodium salt supplementation of 1 000,1 500 and 2 000 mg·kg^-1improved crude protein apparent availability of 42 day-old of broilers compared with control group（ P0.05）,but the apparent availability of dry matter,metabolic energy and ether extract had no significant change. Supplementation of 500 and 1 000 mg·kg^-1increased lipases activities of pancreas（ P0.05）,and feeding with N,N-dimethylglycine sodium salt supplementation of 1 500 and2 000 mg·kg^-1improved trypsin activities of broilers（ P〈0. 05）. [Conclusions]Feeding with N,N-dimethylglycine sodium salt supplementation of 1 000-1 500 mg·kg^-1raised apparent metabolic rate and digestive enzymes of broilers,and significantly improved the growth performance of broilers.