Effects of dietary phosphorus on growth, body composition, and blood chemistry of juvenile taimen Hucho taimen

文献类型： 外文期刊

第一作者： Wang, Chang'an

作者： Wang, Chang'an;Wang, Liansheng;Li, Jinnan;Qin, Dongli;Zhao, Zhigang;Luo, Liang;Du, Xue;Xu, Qiyou;Yin, Jiasheng

作者机构：

关键词： Salmonids;Mineral nutrition;Proximate composition;Hematology

期刊名称：AQUACULTURE INTERNATIONAL （ 影响因子：2.235； 五年影响因子：2.616 ）

ISSN： 0967-6120

年卷期： 2017 年 25 卷 6 期

页码：

收录情况： SCI

摘要： To determine the optimum P requirements of taimen (Hucho taimen), the present study investigated the effects of diets supplemented with different levels of inorganic P (NaH2PO4) on growth, proximate composition, blood chemistry, and mineralization in juvenile taimen. Triplicate groups of fish (mean initial weight 15.39 +/- 0.28 g) were fed, until satiation, with different diets containing graded levels of digestible P (0.22, 0.40, 0.55, 0.74, 0.90, and 1.07%), for 84 days. Weight gain, feed conversion ratio, and protein retention were significantly (P < 0.05) improved with 0.40% dietary P, with values 210.69 +/- 16.08%, 1.13 +/- 0.11, and 31.73 +/- 3.34%, respectively. However, no significant increase in these parameters was obtained with increasing dietary P levels (P > 0.05). With increasing dietary P levels, P retention and whole-body lipid content decreased from 75.41 +/- 7.06 to 36.41 +/- 3.30% and from 3.23 +/- 0.13 to 2.74 +/- 0.25%, respectively, whereas vertebrae ash and plasma P content increased from 43.68 +/- 0.23 to 52.09 +/- 0.28% and from 2.18 +/- 0.14 to 3.98 +/- 0.23 mmol L-1, respectively. Using a broken-line regression model that incorporated measurements of P digestibility, feed efficiency, and normal whole-body and vertebrae P content, the dietary requirement of digestible P was determined to be approximately 0.5% for taimen.

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