饲粮苏氨酸水平对肉鸡生长性能、血清生化指标、抗氧化能力和肠道形态的影响。
Effects of dietary threonine levels on growth performance, serum biochemical indexes, antioxidant capacities, and gut morphology in broiler chickens.
出版信息
Poult Sci. 2017 May 1;96(5):1290-1297. doi: 10.3382/ps/pew393.
A dose-response experiment was conducted to investigate the impacts of dietary threonine (Thr) levels on growth performance, serum biochemical indices, antioxidant capacities, and gut morphology of broiler chickens. Four hundred and thirty-two 1-d-old commercial broilers were allocated to 4 treatments consisting of 6 replicates of 18 birds. The experimental treatments received the same Thr-deficient basal diet and were labeled as follows: 85%, 100%, 125%, and 150% of NRC (1994) recommendations. The results demonstrated that on 21 d and 42 d, average daily weight gain (ADG, 22 to 42 d, 0 to 42 d) increased quadratically or cubically as the inclusion of Thr increased, while feed conversion ratio (FCR, 0 to 21 d, 0 to 42 d) decreased quadratically or cubically as dietary Thr increase from 85% to 150%. Excess dietary Thr levels triggered plasma aspartate aminotransferase (AST) and alanine aminotransferase (ALT) activities. The concentrations of total protein (TP) and globulin (GLO) increased quadratically with increasing Thr level, and the highest concentrations of TP and GLO were obtained at the 125% Thr level. Moreover, the plasma uric acid (UA) concentration decreased linearly or quadratically with the increase in dietary Thr level. Likewise, the serum glutathione peroxidase (GSH-Px) and total superoxide dismutases (T-SOD) activities increased quadratically as dietary Thr increased, and the highest activity of GSH-Px was obtained at the 125% Thr level, while the highest T-SOD level occurred in the 100% Thr group. Gut morphology of birds showed significant response to different graded concentrations of Thr level. Villus height (VH), crypt depth (CD), and VH:CD ratio (VH/CD) were increased linearly or quadratically by Thr supplementation. Therefore, the present study suggests that the NRC (1994) recommendations Thr level that was optimum for growth performance, and 125% of the NRC (1994) recommendations Thr level had better effects on biochemical indices, antioxidant function, and gut morphology of broilers.
进行了一项剂量反应试验，以研究饲粮苏氨酸（Thr）水平对肉鸡生长性能、血清生化指标、抗氧化能力和肠道形态的影响。将 432 只 1 日龄商品肉鸡随机分配到 4 个处理组，每组 6 个重复，每个重复 18 只鸡。试验处理组接受相同的 Thr 缺乏基础日粮，并标记如下：NRC（1994）推荐量的 85%、100%、125%和 150%。结果表明，在 21 日龄和 42 日龄时，随着 Thr 添加量的增加，平均日增重（ADG，22 至 42 日龄，0 至 42 日龄）呈二次或三次曲线增加，而随着饲粮 Thr 从 85%增加到 150%，饲料转化率（FCR，0 至 21 日龄，0 至 42 日龄）呈二次或三次曲线降低。饲粮 Thr 水平过高会引起血浆天冬氨酸转氨酶（AST）和丙氨酸转氨酶（ALT）活性升高。总蛋白（TP）和球蛋白（GLO）浓度随 Thr 水平的增加呈二次曲线增加，TP 和 GLO 浓度最高在 125%Thr 水平。此外，血浆尿酸（UA）浓度随饲粮 Thr 水平的增加呈线性或二次曲线下降。同样，随着饲粮 Thr 的增加，血清谷胱甘肽过氧化物酶（GSH-Px）和总超氧化物歧化酶（T-SOD）活性呈二次曲线增加，GSH-Px 活性最高在 125%Thr 水平，而 T-SOD 水平最高在 100%Thr 组。不同梯度 Thr 水平对鸡肠道形态有显著影响。绒毛高度（VH）、隐窝深度（CD）和 VH:CD 比值（VH/CD）随 Thr 补充呈线性或二次增加。因此，本研究表明，NRC（1994）推荐的生长性能最佳 Thr 水平，以及 NRC（1994）推荐 Thr 水平的 125%对肉鸡的生化指标、抗氧化功能和肠道形态有更好的效果。
Zotero 插件