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首页> 外文期刊>The Journal of Applied Poultry Research >The effect of supplemental L-threonine on laying performance, serum free aminoacids, and immune function of laying hens under high-temperature and high-humidity environmental climates
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The effect of supplemental L-threonine on laying performance, serum free aminoacids, and immune function of laying hens under high-temperature and high-humidity environmental climates

机译：补充L-苏氨酸对高温高湿环境气候下蛋鸡产蛋性能，血清游离氨基酸和免疫功能的影响

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Babcock Brown layers (n = 960), 40 wk of age, were allocated to 1 of 5 dietary treatments groups, each of which included 6 replicates of 32 hens. Each group received the same basal diet formulated with corn, peanut meal, and crystalline amino acids for 8 wk.l-Threonine was added to the basal diet at 0 (control), 0.1, 0.2, 0.3, and 0.4%, toachieve 0.47 (NRC, 1994), 0.57, 0.67, 0.77, and 0.87% threonine, respectively. Although supplementing the diet with l-threonine did not affect ADFI, FCR, egg weight, or egg quality (P > 0.05), the egg production response to supplemental l-threonine was quadratic, and it was maximized at 0.2% supplemental l-threonine. No differences were observed for uric acid, lactate dehydrogenase, alkaline phosphatase, Ca, and P concentrations amongthe treatments. Serum total protein concentration increased quadratically to supplemental threonine, and the response was maximized at 0.2 and 0.3% supplemental l-threonine. Serum free threonine increased quadratically as supplemental threonine increased, and the response was maximized between 0.2 and 0.3% supplemental l-threonine. The addition ofl-threonine at 0.3% of the diet resulted in linearly increasing levels of IgG and total Ig (P < 0.05) as compared with those of the control group. In conclusion, current NRC (1994) recommendations for dietary threonine are insufficient for modern commercial laying hens strains reared under subtropical summer climates. We suggest that 0.2% threonine resulted in optimal egg production, whereas 0.3% l-threonine may have had a positive effect on the humoral immune response of laying hens under conditions ofhigh temperature and humidity.
机译：将40周龄的Babcock Brown层（n = 960）分配到5个饮食治疗组中的1个中，每个组包括6只重复的32只母鸡。每组均接受相同的基础饮食，分别用玉米，花生粉和8个星期的结晶氨基酸配制。将1-苏氨酸以0（对照），0.1、0.2、0.3和0.4％添加至基础饮食，达到0.47（ NRC，1994年），苏氨酸分别为0.57、0.67、0.77和0.87％。尽管在日粮中添加左旋苏氨酸不会影响ADFI，FCR，蛋重或蛋质量（P> 0.05），但对左旋苏氨酸的产蛋反应是二次的，在添加0.2％左旋苏氨酸时最大。 。处理之间的尿酸，乳酸脱氢酶，碱性磷酸酶，钙和磷浓度未见差异。血清总蛋白浓度二次增加至补充苏氨酸，并且在补充0.2至0.3％的l-苏氨酸时反应最大。随着补充苏氨酸的增加，血清游离苏氨酸呈二次方增加，并且在补充l-苏氨酸的0.2％至0.3％之间反应最大。与对照组相比，在饮食中添加0.3％的1-苏氨酸可导致IgG和总Ig线性增加（P <0.05）。总之，目前的NRC（1994年）关于饮食苏氨酸的建议对于在亚热带夏季气候下饲养的现代商业蛋鸡菌株是不够的。我们建议0.2％的苏氨酸可产生最佳的产蛋量，而0.3％的l-苏氨酸可能在高温和高湿度条件下对蛋鸡的体液免疫反应产生积极影响。

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