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首页> 中文期刊> 《动物营养学报》 >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

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

         
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摘要

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 ]%本试验旨在研究饲粮中添加不同水平色氨酸(Trp)对1～21日龄黄羽肉鸡生产性能、体成分沉积、血清游离Trp以及下丘脑游离Trp和5-羟色胺(5-HT)含量的影响,并根据二次回归模型确定1～21日龄黄羽肉鸡适宜的总Trp和可消化Trp需要量.选用2 000只1日龄岭南黄鸡,采用5×2两因子设计,设5个饲粮Trp水平(0.13%、0.16%、0.19%、0.22%和0.25%)和公母2个性别.结果表明,基础饲粮中添加Trp可显著改善黄羽肉鸡的生产性能(P＜0.05),提高机体蛋白质沉积量和母鸡氮沉积率(P＜0.05),增强机体脂肪和腹脂沉积(P＜0.05).基础饲粮中补充Trp可提高母鸡血清游离Trp浓度和公、母鸡下丘脑中游离Trp浓度(P＜0.05),有提高公、母鸡下丘脑中5-HT浓度的趋势(P＜0.10),且下丘脑5-HT浓度与平均日采食量和Trp日摄入量呈一定正相关(r=0.85,P=0.069),血清游离Trp浓度与下丘脑中游离Trp(r=0.81,P=0.094)和5-HT的浓度(r=0.81,P=0.100)具有一定正相关关系,说明饲粮中Trp可能通过下丘脑5-HT的神经递质作用来调节黄羽肉鸡的采食量.饲粮中Trp水平与性别对黄羽肉鸡血清和下丘脑中游离Trp浓度、体蛋白质沉积量的影响存在显著互作效应(P＜0.05),表现为母鸡的上述各项指标对饲粮Trp浓度的变化较公鸡敏感.根据二次回归模型估测1～21日龄黄羽肉鸡获得最佳生产性能和最大体成分沉积的95%处的总色氨酸需要量,母鸡为0.200%～0.210%或0.037～0.039g/d,公鸡为0.190%～0.199%或0.036～0.038 g/d;可消化色氨酸需要量,母鸡为0.179%～0.189%或0.033～0.035g/d,公鸡为0.169%～0.179%或0.032～0.034 g/d.试验获得色氨酸需要量估测值因黄羽肉鸡性别、估测指标以及需要量表示方式不同而不同.

著录项

  • 来源
    《动物营养学报》 |2011年第1期|43-52|共10页
  • 作者

    席鹏彬; 林映才; 郑春田; 蒋守群; 周桂莲; 蒋宗勇;

  • 作者单位

    广东省农业科学院畜牧研究所,农业部动物营养与饲料(华南)重点开放实验室,广东省动物育种与营养公共实验室,广州,510640;

    广东省农业科学院畜牧研究所,农业部动物营养与饲料(华南)重点开放实验室,广东省动物育种与营养公共实验室,广州,510640;

    广东省农业科学院畜牧研究所,农业部动物营养与饲料(华南)重点开放实验室,广东省动物育种与营养公共实验室,广州,510640;

    广东省农业科学院畜牧研究所,农业部动物营养与饲料(华南)重点开放实验室,广东省动物育种与营养公共实验室,广州,510640;

    广东省农业科学院畜牧研究所,农业部动物营养与饲料(华南)重点开放实验室,广东省动物育种与营养公共实验室,广州,510640;

    广东省农业科学院畜牧研究所,农业部动物营养与饲料(华南)重点开放实验室,广东省动物育种与营养公共实验室,广州,510640;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 鸡;
  • 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;

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