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- W2915112462 abstract "The efficiency of utilization and thus requirement of essential amino acids (EAAs) of fish are known to be influenced by a number of dietary and biological factors. Very little is known about the effect of body weight on the utilization efficiency of EAAs. A 3 × 3 factorial experiment was carried out to investigate the effect of body weight on lysine utilization efficiency of Nile tilapia (Oreochromis niloticus). Three diets containing graded levels of lysine at 0.9, 1.1 and 1.3% were fed to groups of fish of three weight classes (small, S; medium, M; and large, L) with initial mean body weights of 10, 58, and 248 g. The fish were fed to apparent satiation over a 12-week period at 28 °C in a recirculation system. The results showed that body weight classes significantly affected growth, feed efficiency, whole body composition, and retention efficiencies of protein, energy and lysine. Retention efficiencies of protein, energy and lysine were different across weight classes: lowest in large fish and highest in small fish. Marginal lysine utilization efficiency (lysine gain/lysine intake) was assessed to be 68%, 63% and 47% for S, M and L fish, respectively. It appears that the marginal lysine utilization efficiencies remained relatively high in fish of small and medium sizes but decreased in fish of large size. The effect of body weight on marginal lysine utilization efficiencies could be represented by a linear equation: marginal lysine utilization efficiency (%) = 69–0.078 × body weight (g) (r2 = 0.9997). The efficiencies of lysine utilization for protein gain also followed a similar pattern across body weight classes, with the lowest efficiency at the highest body weight. Results from this study contribute to a better understanding of requirement and utilization of lysine in fish. Results from this study could also be useful for the development of factorial models of amino acid requirement and the formulation of cost-effective diets for Nile tilapia across life stages." @default.
- W2915112462 created "2019-03-02" @default.
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- W2915112462 date "2019-04-01" @default.
- W2915112462 modified "2023-10-18" @default.
- W2915112462 title "Effect of body weight on lysine utilization efficiency in Nile Tilapia (Oreochromis niloticus)" @default.
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- W2915112462 doi "https://doi.org/10.1016/j.aquaculture.2019.02.030" @default.
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