采用不同衡量指标及数学模型估测3～6周龄雌性肉仔鸡赖氨酸需求参数的研究

本试验采用 2种数学模型估测了 3～ 6周龄雌性肉仔鸡不同衡量指标下的赖氨酸需要量。基础日粮由玉米、豆粕、花生粕、玉米蛋白粉等组成 ,含代谢能 (MEn) 12 73MJ/kg ,粗蛋白 18 8% ,蛋氨酸 0 4 4 % ,赖氨酸 0 7%。试验日粮赖氨酸设 5个处理水平 (0 7% ,0 85 % ,1 0 % ,1 15 % ,1 30 % )。每处理设 6个重复 ,每重复 10只鸡。试验末分别检测生产性能、屠宰性能及生化指标并采用折线模型和指数模型估测满足不同生产目标的赖氨酸需要量。结果表明 :赖氨酸水平对 3～ 6周雌性肉仔鸡日增重 (ADWG) ,饲料转化效率 (FCR) ,全净膛率 (CYR) ,胸肌率(BMR) ,腹脂率 (AFR)有显著影响 (P <0 .0 5 )。按不同衡量指标得出赖氨酸需要量估测值不同 ,其大小顺序为 :满足最大ADWG需要 <满足最大BMR需要 <满足最大CYR需要 <满足最佳FCR需要 <满足最低AFR需要。按折线模型估测 ,满足ADWG、BMR、CYR、FCR和AFR的总赖氨酸需要量分别为 :0 88% ,1 0 1% ,0 99% ,0 91% ,1 0 5 % ;按指数模型估测则分别为 0 96 % ,1 15 % ,1 17% ,1 0 5 % ,1 33%。

Lysine Requirement Profiles of 3-6 Weeks Female Broilers Based on Different Criteria Measured and Mathematical Models Used

One experiment was conducted to estimate lysine requirement profiles of 3 6 week old female broiler chicks based on different criteria measured and mathematical models used.Supplemental dietary lysine levels were 0 7%,0 85%,1 0%,1 15%,1 30%.Three hundred 21 day old posthatching Avian broiler chicks were randomly allocated into 5 different groups consisted of six replicates of 10 birds each.The basal diet containing corn,soybean meal,peanut meal and corn gluten meal provided MEn 12 73 MJ/kg,18 8%CP,0 70% total lysine and 0 44% methionine.Average daily weight gain(ADWG)and feed intake(ADFI),feed conversion rate(FCR),percentage of carcass yield(CYR)breast muscle(BMR) and abdominal fat(AFR),plasma concentrations of uric acid(UA) were determined at the end of the experiment.The result showed that dietary lysine levels significantly influence the ADWG,FCR,CYR,and BMR,AFR(P<0 05).There is a hierarchy of requirements based on the criteria measured.The requirement for maximum ADWG is lower than that for BMR,which is lower than the requirements for CYR and FCR;and the requirement for minimum AFR are the highest of all.Based on the broken line model,the total lysine requirements for maximum ADWG,optimal FCR,maximum CYR,maximum BMR and minimum AFR are 0 88%,1 01%,0 99%,0 91%,1 05% respectively;Based on exponential curvilinear model,lysine requirements are 0 96%,1 15%,1 17%,1 05%,1 33% respectively.