Effects of dietary energy and methionine on growth performance and carcass traits of growing Pekin ducks from 15 to 42 days of age

文献类型： 外文期刊

第一作者： Wu, Y. B.

作者： Wu, Y. B.;Tang, J.;Xie, M.;Zhao, R.;Huang, W.;Zhang, Q.;Hou, S. S.

作者机构：

关键词： duck; energy; methionine; growth performance; requirement

期刊名称：POULTRY SCIENCE （ 影响因子：3.352； 五年影响因子：3.679 ）

ISSN： 0032-5791

年卷期： 2019 年 98 卷 11 期

页码：

收录情况： SCI

摘要： A 2 x 5 factorial experiment, using 2 dietary metabolizable energy (ME) levels (10.82, 12.95 MJ/kg) and 5 supplemental methionine (Met) levels (0, 0.075, 0.15, 0.225, and 0.30%), was conducted to investigate the effects of dietary energy and Met levels on growth performance and carcass traits of Pekin ducks from 15 to 42 D of age. A total of 300 15-day-old male Pekin ducks were randomly allocated to 10 groups with 6 replicates in each group and 5 ducks per replicate. The results showed that ducks those fed the basal diets without Met supplementation had poor growth performance. The ADG was increased (P < 0.001), and the ADFI and feed conversion ratio (FCR) decreased (P < 0.001) when Met were supplemented in diets. The ADFI and FCR were decreased (P < 0.001), while ADG was not affected (P > 0.05) when dietary ME level increased from 10.82 to 12.95 MJ/kg. Dietary Met supplementation increased the yields of eviscerated carcass (P = 0.007) and breast meat (P < 0.001), and decreased abdominal fat (P < 0.001), but increasing dietary energy level resulted in an adverse effect on carcass traits. We observed an interaction effect on FCR between dietary energy and supplemental Met level (P = 0.033). According to the broken-line models, Met requirements of growing Pekin ducks for optimal FCR at 10.82 and 12.95 MJ/kg of ME were 0.406 and 0.502% when expressed as percentage of diet, or 0.376 and 0.388 when expressed as g/MJ ME of diet, respectively. According to the t-test, Met requirements were different (P < 0.05) when expressed as percentage of diet, but had no difference (P > 0.05) when expressed as g/MJ ME of diet in both dietary ME levels. It indicated that Met requirement was affected by dietary ME level, but the Met/ME ratio was relatively constant in diet of Pekin ducks from 15 to 42 D of age.

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