动物营养学报2011，Vol.23Issue(1)：43-52,10.DOI:10.3969/j.issn.1006-267x.2011.01.008
饲粮色氨酸水平对1～21日龄黄羽肉鸡生长、体成分沉积及下丘脑5-羟色胺的影响
Effects of Dietary Tryptophan Levels on Growth, Whole-body Nutrient Retention and Hypothalamic Serotonin Concentration in Yellow-feathered Broilers Aged 1 to 21 Days
摘要
Abstract
The trial was conducted to investigate the effects of dietary tryptophan ( Trp) levels on growth performance, whole-body nutrient retention. serum free Trp, and the concentration of hypothalamic serotonin (5-HT) and free Trp in order to determine total and digestible Trp requirements of yellow-feathered broiler chicks aged 1 to 21 days based on quadratic regression models. Two thousand 1-day-old yellow-feathered broiler chicks were used. Five dietary treatments were compared in a 5 × 2 factorial arrangement with five dietary Trp levels (0. 13％ , 0. 16％ , 0. 19％ ,0. 22％ and 0. 25％ ) and two genders. The results showed that supplementation of synthetic Trp in the basal diet increased growth performance ( P ＜ 0. 05 ) . whole-body protein retention ( P ＜ 0. 05) , whole-body fat and abdominal deposition ( P ＜ 0. 05 ) . and the concentrations of hypothalamic 5-HT ( P ＜0. 10 ) and free Trp ( P ＜0. 05 ) of yellow-feathered broiler chicks. It also increased whole-body nitrogen retention ratio ( P ＜ 0. 05 ) and serum free Trp concentration ( P ＜ 0. 05 ) of female yellow-feathered broiler chicks. Hypothalamic 5-HT concentration positively correlated with average daily feed intake ( ADFI) or daily Trp intake ( r =0. 85. P =0. 069 ) . and serum free Trp concentration positively correlated with the concentrations of free Trp ( r =0. 81 . P = 0. 094 ) and 5-HT in hypothalamus ( r = 0. 81,P =0. 100 ) , indicating that dietary Trp regulated feed intake via hypothalamic 5-HT as neurotransmitter. There were interactions between dietary Trp levels and gender in the concentrations of serum free Trp and hypothalamic free Trp and the whole-body protein retention ( P ＜0. 05 ) . Responses of female chicks to dietary Trp levels were greater than those of male chicks. Based on 95％ of the maximum growth performance and wholebody nutrients retention. the estimated total Trp and digestible Trp requirements for female birds were 0. 200％ to 0. 210％ or 0. 037 to 0. 039 g/d ( total Trp) , and 0. 179％ to 0. 189％ or 0. 033 to 0. 035 g/d ( digestible Trp) , and for male birds were 0. 190％ to 0. 199％ or 0. 036 to 0. 038 g/d ( total Trp) , and 0. 169％ to 0. 179％ or 0. 032 to 0. 034 g/d ( digestible Trp) , respectively. The estimated values of Trp requirement are impacted by response parameters, gender and expression methods. [ Chinese Journal of Animal Nutrition ,2011,23 (1) :43-52 ]关键词
色氨酸/生产性能/体成分沉积/下丘脑5-羟色胺/营养需要量/黄羽肉鸡分类
农业科技引用本文复制引用
席鹏彬,林映才,郑春田,蒋守群,周桂莲,蒋宗勇..饲粮色氨酸水平对1～21日龄黄羽肉鸡生长、体成分沉积及下丘脑5-羟色胺的影响[J].动物营养学报,2011,23(1):43-52,10.基金项目
现代农业产业技术体系建设专项资金及公益性行业科研专项(nyhyzx07-038) （nyhyzx07-038）
