Dietary lysine requirement of juvenile Jian carp (cyprinus carpio var. Jian)
2008
ZHOU, X.-Q. | ZHAO, C.-R. | Jiang, J. | FENG, L. | LIU, Y.
This study was designed to determine the dietary lysine requirement of juvenile Jian carp (cyprinus carpio var. Jian). A total of 990 juvenile Jian carps (initial weight 7.89 ± 0.04 g) were randomly allocated six groups of each three replicates, feeding isonitrogenous (320 g kg⁻¹ crude protein) and isolipidic (50 g kg⁻¹ crude fat) diets containing graded levels of coated l-lysine, with dietary lysine content ranging from 22 to 69 g kg⁻¹ of protein, respectively, for 80 days. Final weight, protein deposition and protein production value were significantly improved in response to the increasing levels of dietary lysine up to 59 g kg⁻¹ of protein and remained nearly constant thereafter. Whole-body protein content followed a similar pattern as growth parameters in relation to dietary lysine level. Hepatopancreas and intestine protein content, hepatopancreas index (HSI) and intestine index (ISI) were positively affected by dietary lysine level. The dietary lysine requirement of juvenile Jian carp estimated by broken line analysis based on weight gain was 59 g kg⁻¹ of protein.
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