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《Chinese Journal of Animal and Veterinary Sciences》 2002-03
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Lysine Requirement Profiles of 3-6 Weeks Female Broilers Based on Different Criteria Measured and Mathematical Models Used

LIU Sheng jun,GUO Yu ming (Department of Animal Science and Technology, China Agricultural University,Beijing 100094,China)  
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(P0 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.
【CateGory Index】: S831.5
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