Apparent metabolizable energy requirement of feed-restricted White Pekin duck breeder pullets
文献类型： 外文期刊
作者： Xie, M. 1 ; Meng, R. Z. 2 ; Tang, J. 1 ; Guo, Z. B. 1 ; Huang, W. 1 ; Zhang, Q. 1 ; Hou, S. S. 1 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Anim Sci, Beijing 100193, Peoples R China
2.China Agr Univ, Coll Vet Med, Beijing 100193, Peoples R China
3.State Key Lab Anim Nutr, Beijing 100193, Peoples R China
关键词： Duck breeder pullets; Energy; Requirement
期刊名称：ANIMAL FEED SCIENCE AND TECHNOLOGY （ 影响因子：3.2； 五年影响因子：3.6 ）
ISSN： 0377-8401
年卷期： 2023 年 295 卷
页码：
收录情况： SCI
摘要： A dose-response experiment with 5 dietary apparent metabolizable energy (AME) levels (10.00, 10.62, 11.24, 11.87, and 12.49 MJ AME/kg) was conducted to estimate the AME requirement of White Pekin duck breeder pullets from 8 to 24 weeks of age. A total of 240 8-week-old female White Pekin duck breeder pullets were assigned to 5 experimental treatments, and each treatment was replicated 6 times with 8 birds per replicate. The ducks were reared in raised wire-floor pens from 8 to 24 weeks of age. All duck pullets were restricted-fed by limiting feed intake, and the feed intake increased gradually as age increased. At 24 weeks of age, the body weight, weight gain and feed/gain of each treatment were measured, and the relative weight of abdominal fat, skin and fat, and ovary of pullets and the contents of luteinizing hormone, follicle-stimulating hormone, and estradiol in plasma were also determined. As the dietary energy level increased from 10.00 to 12.49MJ AME/kg, the 24-week-old body weight and weight gain increased linearly or quadratically (P < 0.05) and the feed/gain decreased linearly or quadratically (P < 0.05). The absolute or relative weight of abdominal fat and skin and fat of the duck pullets also showed a linear increasing response to increasing dietary energy (P < 0.05). The duck pullets fed with high dietary energy levels had a higher absolute or relative weight of ovary than the birds fed with low dietary energy (P < 0.05) and this was accompanied by linearly or quadratically increasing plasma follicle-stimulating hormone and estradiol as dietary energy increased (P < 0.05). According to broken-line regression, the AME requirements for feed/gain and relative weight of skin and fat were 12.40, and 11.92 MJ/kg, respectively, and low AME requirements should be considered to control body weight and fat before laying age.
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