Open AccessEffect of dietary l ‐lysine levels on growth, feed conversion, lysine retention efficiency and haematological indices of Heteropneustes fossilis (Bloch) fry
Author(s) -
KHAN M.A.,
ABIDI S.F.
Publication year - 2011
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/j.1365-2095.2010.00815.x
Subject(s) - lysine , feed conversion ratio , biology , heteropneustes fossilis , zoology , nutrient , protein efficiency ratio , food science , biochemistry , amino acid , body weight , fish <actinopterygii> , endocrinology , ecology , catfish , fishery
Abstract Effect of varying dietary lysine levels on growth, feed conversion, nutrient retention, lysine retention efficiency and haematological indices of Heteropneustes fossilis fry (2.97 ± 0.11 cm; 4.78 ± 0.31 g) was studied by conducting a 12‐week feeding trial. Isonitrogenous (450 g kg −1 CP) and isocaloric (17.97 kJ g −1 GE) amino acid test diets with graded concentrations of l ‐lysine (18, 20, 22, 24, 26, 28 g kg −1 dry diet) were fed to triplicate groups of fish to apparent satiation twice daily at 17 and 17:30 h. Maximum thermal growth coefficient (TGC, 0.82), best feed conversion ratio (FCR, 1.28) highest protein retention efficiency (PRE, 36%), energy retention efficiency (ERE, 79%) and lysine retention efficiency (LRE, 75%) were noted at 24 g kg −1 lysine of dry diet. Body protein was also found to be in line with growth data and peaked at 24 g kg −1 lysine of dry diet. Similarly, superior somatic and haematological indices were exhibited by the groups fed dietary lysine at 24 g kg −1 of the dry diet. However, exponential analysis of dietary lysine intake against TGC, lysine retention and protein retention indicated that inclusion of dietary lysine in the range of 13.24–14.14 g kg −1 dry diet, corresponding to 29.42–31.42 g kg −1 dietary protein, is essential for faster growth of this fish.