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《Chinese Journal of Animal Nutrition》 2011-12
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Dietary Tryptophan Level Affects Performance,Antioxidant Function and Serum Biochemical Indices of Yellow-Feathered Broiler Breeders

MA Yu'e1 ZHAN Xiuan1 ZHU Qiaoming2 LIU Weilong1 XIA Lei1(1.Institute of Feed Science,Zhejiang University,Hangzhou 310029,China; 2.Zhejiang Xinxin Feed Co.,Ltd.,Jiaxing 314005,China)  
The experiment was conducted to study the effects of dietary tryptophan levels on performance,antioxidant function and serum biochemical indices of yellow-feathered broiler breeders,and aimed to discuss a suitable supplemental level of tryptophan for the broiler breeders.Using a single factor and 4 levels arrangement of treatments design,a total of 360 yellow-feathered broiler breeders(28-week-old) were randomly allocated into 4 groups with 3 replicates in each group and 30 broiler breeders in each replicate.Broilers in control group were fed a basal diet which containing 0.16% tryptophan,and the others in experimental groups were fed the basal diet supplemented with 0.02%,0.04% and 0.06% tryptophan,respectively.Pre-treatment period was 2 weeks and the experiment lasted for 8 weeks.The results showed as follows: 1) compared with the control group,each experimental group significantly increased the fertility rate,hatchability and birth rate(P0.05),and the 0.18% tryptophan group was the highest among them.2) Compared with the control group,the average body weight in the 0.18% tryptophan group increased 3.99%(P0.05),the activity of glutathione peroxidase and the contents of total protein and albumin increased 12.58%,13.40% and 4.02%(P0.05),respectively.3) The experimental groups had a trend of increasing the superoxide dismutase activity,total anti-oxidant capability and the content of reduced glutathione hormone,there also had a trend of reducing malondialdehyde and uric acid concentration in serum,however,there was no significant difference among those groups(P0.05).4) There was no significant difference among the groups in laying rate,average egg weight and feed/egg weight(P0.05),but the average daily feed intake in experimental groups was significantly elevated compared with the control group(P0.05).In conclusion,the optimal tryptophan level in corn-soybean meal diet of yellow-feathered broiler breeders is 0.18%.
【Fund】: 现代农业产业技术体系建设专项资金资助(CARS-42-G19)
【CateGory Index】: S831.5
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