日粮中添加有机铬对肉仔鸡血液生化指标和腹脂率的影响

Effects of dietary chromium on blood biochemical indexes and yield of abdominal fat of broiler chickens

【目的】比较2种有机铬源(吡啶羧酸铬和柠檬酸铬)及其不同添加水平对肉仔鸡血液生化指标和腹脂率的影响,为有机铬在生产中的应用提供依据。【方法】选取1日龄爱拔益加肉鸡450只,随机分为5组(共5个处理),每组3个重复,每个重复30只。对照组按"NRC肉鸡标准推荐量"标准饲喂基础日粮,4个试验组分别饲喂添加0.25和0.50mg/kg吡啶羧酸铬及0.25和0.50mg/kg柠檬酸铬的日粮,试验期为42d。分别于28日龄和42日龄翅静脉采血,分离血清进行血清生化指标(血糖、总蛋白、白蛋白、球蛋白、尿酸、总胆固醇、甘油三酯、高密度脂蛋白和低密度脂蛋白)的测定。【结果】试验前期(1～28日龄),日粮中添加低浓度(0.25mg/kg)柠檬酸铬组肉仔鸡的血糖浓度显著低于添加高浓度(0.50mg/kg)柠檬酸铬组(P<0.05);添加高浓度(0.50mg/kg)吡啶羧酸铬组肉仔鸡总蛋白含量显著高于添加高浓度(0.50mg/kg)柠檬酸铬组和对照组(P<0.05);添加低浓度吡啶羧酸铬组肉仔鸡血液中高密度脂蛋白浓度显著高于添加高浓度柠檬酸铬组(P<0.05)。试验后期(29～42日龄),日粮中添加高浓度柠檬酸铬组肉仔鸡血糖浓度显著低于对照组(P<0.05),添加低浓度吡啶羧酸铬组肉仔鸡甘油三酯含量显著高于对照组(P<0.05)。【结论】肉仔鸡生长前期日粮中添加0.25mg/kg柠檬酸铬可显著降低肉仔鸡血糖浓度(P<0.05);添加0.50mg/kg吡啶羧酸铬可显著提高总蛋白含量(P<0.05);后期日粮中添加0.50mg/kg柠檬酸铬可显著降低肉仔鸡血糖浓度(P<0.05),添加0.25mg/kg吡啶羧酸铬对甘油三酯有显著影响(P<0.05)。日粮中添加两种铬后,肉仔鸡的腹脂率在生长前期有所降低,而后期又呈增高趋势。

[Objective] We conducted an experiment to evaluate the effects of Chromium Picolinate(CP)and Chromium Citrate(CC)on blood biochemical indexes and yield of abdominal fat of broilers.[Method] 450 one-day-old Arbor Acres male broilers were randomly allocated to five treatments with three replicates of thirty broilers each.Birds in control group were fed a corn-soybean meal diet according to the feeding standard of broilers(NRC).Experimental group birds were fed the same corn-soybean meal diet supplemented with...