Methionine and lysine requirements for maintenance and efficiency of utilization for growth of two sizes of tilapia (Oreochromis niloticus)

文献类型： 外文期刊

第一作者： He, J. -Y.

作者： He, J. -Y.;Tian, L. -X.;Yang, H. -J.;Liang, G. -Y.;Chen, P. -F.;Liu, Y. -J.;Lemme, A.;Gao, W.;Niu, J.

作者机构：

关键词： fish size;lysine utilization efficiency;maintenance requirement;methionine utilization efficiency;Oreochromis niloticus;ration levels

期刊名称：AQUACULTURE NUTRITION （ 影响因子：3.497； 五年影响因子：3.78 ）

ISSN： 1353-5773

年卷期： 2013 年 19 卷 4 期

页码：

收录情况： SCI

摘要： Different ration levels were used to determine the digestible methionine (DMet) and lysine (DLys) maintenance requirements and the utilization efficiencies for gain above maintenance for two different sizes of tilapia (20.7 and 165g), by feeding a soybean meal-based diet. Protein gain and amino acid (AA) gain (e.g. methionine, Met; lysine, Lys; R-2=0.98) were best-fit linear functions of DMet and DLys intake in both fish size classes. Slopes of these regression lines showed that the DMet utilization efficiencies for growth were 0.76 and 0.55 for juvenile and adult fish, respectively. The DMet maintenance requirements were 3.12 and 16.5mg BW(kg)(-0.7)day(-1) for juvenile and adult fish, respectively. The DLys utilization efficiencies for gain were 0.72 and 0.52, whereas the DLys maintenance requirements were 16.9 and 68.8mg BW (kg)(-0.7)day(-1), for juvenile and adult fish, respectively. These results suggested that there was an obvious difference in the maintenance requirements and utilization efficiencies for gain above maintenance for DMet and DLys in two different sizes of tilapia. The AA maintenance needs increased as fish increased in size, being greater in adult fish than in juvenile; however, the AA utilization efficiencies for gain above maintenance decreased with the increment of fish size.

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