摘要
本试验旨在研究饲粮蛋氨酸水平对30～38周龄临武鸭生产性能、蛋品质和血清生化指标的影响，以确定临武鸭产蛋高峰期蛋氨酸的需要量。选取体重相近、健康状况良好的临武鸭200羽，随机分为5组，每组5个重复，每个重复8只鸭。饲粮蛋氨酸水平分别为0．27％、0．32％、0．37％、0．42％、0．47％，试验全期63 d。结果显示：1）饲粮蛋氨酸水平对产蛋率和合格蛋率无显著影响（P＞0．05）。0．37％、0．42％、0．47％组的平均日采食量和料蛋比均显著低于0．27％组（P＜0．05），而0．37％组的平均蛋重和日产蛋量显著高于0．27％组（P＜0．05）。0．37％组获得了除合格蛋率外最佳的产蛋性能。2）饲粮蛋氨酸水平对蛋鸭蛋形指数、蛋壳厚度、蛋黄色泽、蛋黄比例、蛋壳比例、蛋白比例的影响均不显著（ P＞0．05），但0．42％组蛋白高度和哈氏单位最大且显著高于0．27％和0．32％组（ P＜0．05）。3）饲粮蛋氨酸水平对蛋鸭血清中总蛋白、白蛋白、尿素氮、尿酸和丙二醛含量均无显著影响（ P＞0．05）。与0．27％组相比，其他4组的血清超氧化物歧化酶活性显著提高（ P＜0．05），0．37％、0．42％、0．47％组血清谷胱甘肽（ GSH）含量和谷胱甘肽过氧化物酶（GSH？Px）活性均显著高于0．27％组（P＜0．05）。4）以作为评价蛋氨酸需要量敏感指标的料蛋比和血清中GSH含量为依据，通过回归分析估测得到产蛋高峰期临武鸭获得最小料蛋比和最大GSH含量所对应的饲粮中蛋氨酸需要量分别为0．41％和0．43％。综上所述，在本试验条件下，当蛋氨酸水平为0．41％～0．43％时，产蛋高峰期临武鸭可获得最佳产蛋性能、蛋品质和血清生化指标。因此30～38周龄临武鸭蛋氨酸推荐量为0．41％～0．43％。
This experiment was conducted to study the effects of dietary methionine （ Met ） level on growth performance, egg quality and serum biochemical indices of Linwu ducks aged form 30 to 38 weeks, and to e-valuate Met requirement of Linwu ducks during the peak laying period. A total of 200 healthy Linwu ducks with nearly same body weight were randomly assigned to 5 groups with 5 replicates in each group and 8 ducks in each replicate. Ducks in the 5 groups were fed basal diets supplemented with 0.27%, 0.32%, 0.37%, 0.42%and 0.47% Met, respectively. The experiment lasted for 63 days. The results showed as follows： 1） dietary Met level had no significant effects on laying rate and qualified rate of egg （ P〉0.05） . The average daily feed intake and feed/egg in 0.37%, 0.42% and 0.47% Met group were significantly lower than that in 0.27% Met group （ P〈0.05） , but the daily egg yield and average egg weight in 0.37% Met group was significantly higher than that in 0.27% Met group （P〈0.05）.The 0.37% Met group obtained the best performance except qualified rate of egg. 2） Dietary Met level had no significant effects on egg-shaped index, egg shell thickness, egg yolk color, yolk ratio, percentage of eggshell and protein ratio （P〉0.05）, but albumen height and Haugh unit in 0.42% Met group were highest and significantly higher than those in 0.27% and 0.32% Met group （ P〈0.05） . 3） Dietary Met level had no significant effects on the contents of total protein, albumin, urea nitrogen, uric acid and malondialdehyde in serum （P〉0.05）. Compared with 0.27% Met group, the serum superoxide dis-mutase content in the other four groups were significantly improved （ P〈0.05） . The serum glutathione （ GSH） and glutathione peroxides content in 0.37%, 0.42% and 0.47% Met groups were significantly higher than that in 0.27% Met group （ P〈0.05） . 4） There was a quadratic behavior for feed/egg and the content of GSH in se-rum according to the Met levels in the diets, with the requiremen
出处
《动物营养学报》
CAS
CSCD
北大核心
2015年第4期1110-1116,共7页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
现代农业产业技术体系建设专项资金(CARS-43-39)
关键词
蛋氨酸
蛋鸭
需要量
methionine
laying duck
requirement
