文献类型： 外文期刊

作者： Feng, Y. L. ¹ ; Xie, M. ¹ ; Tang, J. 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.Guizhou Acad Agr Sci, Guizhou Anim Husb & Vet Res Inst, Guiyang 550000, Guizhou, Peoples R China

关键词： ducks; vitamin A; retinol; growth performance

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 5 期

页码：

收录情况： SCI

摘要： A dose-response experiment with 8 supplemental vitamin A levels (0, 500, 1,000, 1,500, 2,500, 3,500, 7,000, and 14,000IU/kg) were conducted to examine the effects of vitamin A on growth performance and tissue retinol of starter White Pekin ducks. A total of 512 one-day-old male Pekin ducks were randomly divided into 8 treatments and each treatment contained 8 replicate pens of 8 ducks. All these ducks were reared in raised wire-floor pens from hatch to 21 D of age. At 21 D of age, growth performance and retinol concentration in plasma and liver were measured. Among all ducks, the birds fed basal diet with no supplemental vitamin A had the lowest weight gain, feed intake, and plasma and liver retinol (P < 0.05). As supplemental vitamin A increased, weight gain and feed intake increased quadratically (P < 0.05) and plasma and liver retinol increased linearly or quadratically (P < 0.05). The weight gain and plasma retinol showed broken-line response to increasing supplemental vitamin A (P < 0.05). According to broken-line regression, the minimum supplemental vitamin A requirements for weight gain and plasma retinol were 2606 and 4371IU/kg, respectively. It was concluded that vitamin A deficiency could lead to a reduction in growth performance and tissue retinol retention and plasma or liver retinol was available biomarker to assess duck vitamin A status.