Response of fingerling stinging catfish, Heteropneustes fossilis (Bloch) to varying levels of dietary l-leucine in relation to growth, feed conversion, protein utilization, leucine retention and blood parameters
Aquaculture Nutrition, ISSN: 1365-2095, Vol: 20, Issue: 3, Page: 291-302
2014
- 37Citations
- 21Captures
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Article Description
Growth response of fingerling Heteropneustes fossilis (6.8 ± 0.2 g; 11.2 ± 0.3 cm) to dietary l-leucine levels was assessed by conducting 8-week feeding trial in a flow-through system (1-1.5 L min) at 28 °C water temperature. Casein-gelatin-based isonitrogenous (380 g kg; crude protein) and isoenergetic [17.9 MJ kg; gross energy (GE)] basal diet was supplemented with different levels of l-leucine to achieve desired leucine levels ranging between 10 and 22.5 g kg dry diet. Analysed values were 9.9 (Lc), 12.4 (Lc), 15.1 (Lc), 17.4 (Lc), 20.1 (Lc) and 22.4 (Lc) g leucine kg diet. Fishes were stocked randomly in quadruplicates and fed to satiation at 07:00 and 17:30 h. Maximum absolute weight gain (AWG g fish), feed conversion ratio (FCR), protein utilization efficiency (PUE%), leucine retention efficiency (LRE%) and haematological parameters were found in fish fed diet Lc. For precise determination of dietary leucine requirement of Singhi, AWG g fish, FCR, PUE% and LRE% were subjected to broken-line and second-degree polynomial regression analysis. Second-degree polynomial regression analysis fitted the data more accurately (P > 0.05) exhibiting high R values. Hence, based on this analysis, dietary leucine requirement of fingerling H. fossilis is recommended to be 16.5 g kg of the diet, corresponding to 43.4 g kg protein for developing leucine-balanced commercial feeds. © 2013 John Wiley & Sons Ltd.
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