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Abstract

EFFECTS OF DIETARY PROTEIN AND LIPID LEVELS ON GROWTH, FEED UTILIZATION AND BODY COMPOSITION OF JUVENILE GRASS CARP (Ctenopharyngodon idella)

A growth trial was conducted for 90 days to evaluate the effects of dietary protein and lipid levels on growth performance, feed utilization, and whole body chemical composition of juve-nile grass carp. Six practical diets containing two dietary digestible protein levels (P1: 33% and P2: 37%) and three lipid levels (L1: 4%, L2: 6% and L3: 8%) were prepared. Fish were fed to satiation three times a day. There were significant differences between the weight gain (387-594%), specific growth rate (1.7-2.1%), feed intake (46.1-51.4 g fish-1), feed conversion ratio (FCR, 1.2-1.7), protein efficiency ratio (PER, 1.6-2.4), hepatosomatic index (3-3.2%), digesti-ble protein (87.4-93.5%), lipid (91.1-97.6%) and energy (87.6-93.5%) values and the whole body fat content (16.6-18.6%) for fish fed on the experimental diets. Growth-performance, FCR, PER, feed intake, digestible protein, lipid and energy values were found higher for P1L2 diet group compared to all other experimental diets (P


Author(s): Kenan KÖPRÜCÜ

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