饲粮代谢能和可消化赖氨酸水平对21～42日龄肉仔鸡生长性能及血清生化指标的影响  

Effects of Dietary Metabolizable Energy and Digestible Lysine Levels on Growth Performance and Serum Biochemical Parameters of Broilers at the Age of 21 to 42 Days

作　　者：杨桂芹[1] 韩钰婧[1] 张文克[1] 刘国华[2] 郑爱娟[2] 

机构地区：[1]沈阳农业大学畜牧兽医学院,沈阳110161 [2]中国农业科学院饲料研究所,北京100081

出　　处：《动物营养学报》2013年第2期281-288,共8页CHINESE JOURNAL OF ANIMAL NUTRITION

基　　金："十二五"农村领域国家科技计划(2011BAD26B03)

摘　　要：为研究饲粮代谢能(ME)、可消化赖氨酸(DLys)水平及其互作效应对21～42日龄肉仔鸡生长性能及血清生化指标的影响,试验采用2×3两因子交叉设计,包括2个ME水平:13.18、12.55 MJ/kg,3个DLys水平:0.80%、0.95%和1.10%,依据理想氨基酸平衡模式配制6种饲粮。选择360只平均体重(718.6±28.6)g的21日龄爱拔益加肉仔鸡,随机分为6组,每组6个重复,进行21 d的饲养试验,期末屠宰,同时测定血清生化指标。结果表明:高ME高DLys组具有最高的平均日增重、平均日采食量和最低的料重比(1.86),饲粮ME和DLys水平对平均日采食量存在极显著的互作效应(P<0.01);饲粮ME和DLys水平及其互作效应对屠宰率、全净膛率和腿肌率均无显著影响(P>0.05)。低ME高DLys组胸肌率(30.43%)最高、腹脂率(1.09%)最低,饲粮ME和DLys水平对胸肌率存在显著的互作效应(P<0.05);饲粮ME和DLys水平对血清尿素氮含量分别有极显著(P<0.01)和显著(P<0.05)影响,对血清谷草转氨酶活性有显著的互作效应(P<0.05),高ME高DLys组血清尿素氮含量最低。综合生长性能和屠宰性能的分析结果可知,在本试验条件下,对21～42日龄肉仔鸡,饲粮适宜ME和DLys水平分别为12.55 MJ/kg和1.10%(ME/DLys=1.141 MJ/g)。高ME高DLys(ME/DLys=1.198MJ/g)更利于代谢平衡,减少血清尿素氮含量。This experiment was conducted to evaluate the effects of dietary metabolizable energy （ME） and di- gestible lysine （DLys） levels and their interaction on broiler chickens at the age of 21 to 42 days. The experi- ment was set in a 2 ×3 factorial arrangement, diets contained 2 levels of ME （ 12.55 and 13.18 MJ/kg） in combination with 3 levels of balanced amino acid （ expressed as 0.80% , 0.95% and 1.10% DLys）, three hundred and sixty 21-day-old Arbor Acres broiler chickens with an average body weight of （718.6±28.6 ） g were randomly assigned to 6 groups with 6 replicates per group and 6 birds per replicate. At the end of feeding experiment, birds were slaughtered, and blood samples were assayed for serum biochemical parameters. The results showed that broilers fed the highest ME and DLys diet had the highest average daily gain and average daily feed intake, and the lowest feed/gain ratio （ 1.86）, and the interaction between ME and DLys was sig- nificant in average daily feed intake （ P 〈 0.01 ）. Levels and the interaction effect of dietary ME and DLys were insignificant in dressed percentage, eviscerated percentage and leg muscle percentage （ P 〉 0.05 ） ; broil- ers fed the lowest ME and highest DLys diet had the highest breast muscle percentage （ 30.43 % ） and the low- est abdominal fat percentage （ 1.09% ）, and the interaction effect of ME and DLys was significant in breast muscle percentage （ P 〈 0.05 ）. Serum urea nitrogen content was significantly affected by dietary ME （ P 〈 0.01 ） and DLys levels （ P 〈 0.05 ）, serum urea nitrogen content of broilers fed the highest ME and DLys diet was the lowest, and the interaction effect of ME and DLys was significant in serum glutamic-oxaloacetic trans- aminase activity （ P 〈 0.05）. The results of this experiment indicate that broilers can get the optimum growth performance and carcass performance when the level of dietary ME is 12.55 MJ/kg and the level of dietary DLys is 1.10% （ME/DLys = 1. 141 ）

关 键 词：代谢能 可消化赖氨酸 生长性能 血清生化指标 肉仔鸡 

分 类 号：S831.5[农业科学—畜牧学]