Abstract
Dietary lysine requirement of fingerling Channa punctatus (5.64 ± .08g) was determined by feeding isoproteic (450g/kg crude protein) and isoenergetic (14.73 kJ/g digestible energy) diets with graded concentrations of lysine (5, 10, 15, 20, 25, 30 and 35g/kg dry diet) to triplicate groups to apparent satiation at 08:00, 12:30 and 17:30 h for 12-week. Absolute weight gain (AWG), specific growth rate (SGR), feed conversion ratio (FCR), protein gain (PG), lysine retention efficiency (LRE) and RNA/DNA ratio were found to increase with the increasing concentrations of lysine up to 20g/kg dry diet. Carcass protein increased up to 20g/kg dietary lysine, whereas carcass fat decreased significantly. Total serum protein and superoxide dismutase activity responded positively (p < .05), while aspartate aminotransferase and alanine aminotransferase activities negatively up to 20g/kg dietary lysine level. Quadratic regression analysis of AWG, FCR, PRE, LRE, Hb and Hct against dietary lysine levels indicated the lysine requirement ranging between 22.2 and 24.0g/kg dry diet corresponding to 49.4 and 53.4g/kg protein.
Aquaculture Nutrition, Volume 27, Issue S1, Page 140-150, December 2021. Leer más
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