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首页> 外文期刊>Czech Journal of Animal Science >Effects of dietary threonine on growth performance and carcass traits of Yangzhou geese
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Effects of dietary threonine on growth performance and carcass traits of Yangzhou geese

机译：日粮苏氨酸对扬州鹅生长性能和car体性状的影响

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A dose-response experiment with 5 total dietary threonine (Thr) levels (0.54, 0.64, 0.74, 0.84 and 0.94%) was conducted to study the effect of dietary Thr on growth performance and carcass traits of Yangzhou geese from 0 to 8 weeks of age. Three hundred 1-day-old Yangzhou goslings were randomly allocated to 15 pens with 20 birds (10 males and 10 females) per pen according to similar pen weight. There were 5 dietary treatments, consisting of 3 replicate pens. Weight gain, feed intake and feed/gain of geese from each pen were measured at 2-week intervals from 0 to 8 weeks. At 56 days of age, four geese (2 males and 2 females) were selected randomly from each pen and slaughtered to evaluate the carcass quality. The results showed that an increase in dietary Thr resulted in an increase and then a decrease in daily weight gain in both periods. Peak daily weight gain responses appeared in geese fed the 0.74%Thr diet in both periods (36.120 and 61.96 g, respectively). Thr supplementation significantly affected feed/gain in the 0–4 week period ( P ≤ 0.045) and daily feed intake in the 5–8 week period ( P ≤ 0.012). No significant linear or quadratic responses from Thr supplementation were observed in growth performance and carcass traits of geese except for eviscerated carcass percentage (quadratic effect, P ≤ 0.016). The optimal Thr requirement of Yangzhou geese from 0 to 8 weeks of age was 0.726% for eviscerated carcass percentage. The results of our experiment reported herein would document that the Thr requirements suggested by NRC (1994) for geese up to 8 weeks of age are safe estimates; they may slightly overestimate the requirements but not by a large margin.
机译：进行了一个剂量响应实验，研究了5个总日粮苏氨酸（Thr）水平（0.54、0.64、0.74、0.84和0.94％），以研究日粮Thr对扬州鹅生长性能和car体性状在0至8周的影响。年龄。将300只1天大的扬州幼鹅随机分配给15只钢笔，每只钢笔根据相似的钢笔重量分配20只鸟（10只雄性和10只雌性）。有5种饮食疗法，包括3支重复笔。每隔2周从0到8周测量每只猪的体重增加，采食量和鹅的采食量/增重。在56日龄时，从每只笔中随机选择四只鹅（2只雄性和2只雌性）并宰杀以评估car体质量。结果表明，饮食中Thr的增加导致两个时期的每日体重增加，然后减少。在两个时期中，饲喂0.74％Thr饮食的鹅的日增重峰值出现在高峰期（分别为36.120和61.96 g）。补充Thr会显着影响0–4周期间的饲料/增重（P≤0.045）和5–8周期间的每日饲料摄入量（P≤0.012）。除内脏car体百分比外，未观察到Thr补充剂对鹅的生长性能和car体性状有明显的线性或二次响应（二次效应，P≤0.016）。剔除car体的百分比，扬州鹅从0到8周的最佳Thr需求量为0.726％。我们在此报告的实验结果将证明NRC（1994）建议的对8周龄以下鹅的Thr要求是安全的;他们可能会稍微高估需求，但幅度不会太大。

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