Fouad A M, Ruan D, Lin Y C, Zheng C T, Zhang H X, Chen W, Wang S, Xia W G, Li Y
b Department of Animal Production, Faculty of Agriculture , Cairo University , Giza , Egypt.
a Institute of Animal Science, Guangdong Academy of Agricultural Science , Key Laboratory of Animal Nutrition and Feed Science (South China) of Ministry of Agriculture, State Key Laboratory of Livestock and Poultry Breeding, Guangdong Public Laboratory of Animal Breeding and Nutrition, Guangdong Key Laboratory of Animal Breeding and Nutrition , Guangzhou , China.
Br Poult Sci. 2016 Dec;57(6):818-823. doi: 10.1080/00071668.2016.1222603. Epub 2016 Nov 14.
In this study, 6 dietary DL-methionine (Met) levels (2.5, 3.0, 3.5, 4.0, 4.5 and 5.0 g/kg) were tested to estimate the dietary Met requirements of Longyan ducks from 19 to 46 weeks of age, and to investigate its effect on the glutathione redox system. In total, 1080 Longyan ducks aged 19 weeks were allocated randomly to the 6 dietary treatments, where each treatment comprised 6 replicate pens with 30 ducks per pen. Met had no effects on egg production, yolk weight, yolk colour or the glutathione redox system, but the egg weight, egg mass and feed conversion ratio (FCR) were improved significantly by dietary Met supplementation. As the dietary Met concentration increased, the eggshell thickness and breaking strength decreased significantly, whereas the albumen weight increased significantly. According to broken-line regression analysis, the optimum Met requirements for egg weight, egg mass, FCR and albumen weight are 686, 661, 658 and 731 mg/bird/d, respectively, with a dietary crude protein level of 170 g/kg.
本研究测试了6种日粮DL-蛋氨酸（Met）水平（2.5、3.0、3.5、4.0、4.5和5.0 g/kg），以估计19至46周龄龙岩鸭的日粮蛋氨酸需求量，并研究其对谷胱甘肽氧化还原系统的影响。总共1080只19周龄的龙岩鸭被随机分配到6种日粮处理组，每个处理组包括6个重复栏，每栏30只鸭。蛋氨酸对产蛋量、蛋黄重量、蛋黄颜色或谷胱甘肽氧化还原系统没有影响，但日粮添加蛋氨酸显著提高了蛋重、产蛋量和饲料转化率（FCR）。随着日粮蛋氨酸浓度的增加，蛋壳厚度和破碎强度显著降低，而蛋白重量显著增加。根据折线回归分析，当日粮粗蛋白水平为170 g/kg时，蛋重、产蛋量、FCR和蛋白重量的最佳蛋氨酸需求量分别为686、661、658和731 mg/只/天。
