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- Title
Effect of dietary lipid and protein levels with different protein to energy ratios on growth performance, feed utilization and body composition of Rutilus frisii kutum (Kamenskii, 1901) fingerlings.
- Authors
Ebrahimi, Ghaffar; Ouraji, Hossein; Firouzbakhsh, Farid; Makhdomi, Changiz
- Abstract
A 3 × 5 factorial design including three lipid levels (100, 130 and 180 g kg−1 diet, based on dry matter) and five dietary protein levels (370, 420, 470, 520 and 570 g kg−1 diet, based on dry matter) was conducted to investigate the optimum dietary lipid and protein requirements for Rutilus frisii kutum fingerlings. Triplicate groups of 80 kutum (500 ± 60 mg initial weight) were stocked in 250-l tanks and fed to apparent satiation thrice daily for 8 weeks. The results showed that the growth performance and feed utilization were significantly ( P < 0.05) affected by dietary protein and lipid levels. Weight gain, specific growth rate and feed conversion ratio of kutum improved significantly with increasing protein level from 370 to 470 g protein kg−1 diet, but there was a significant decrease in growth parameters with increasing protein level from 470 to 570 g protein kg−1 diet. Also, the higher values of weight gain, specific growth rate and better feed conversion ratio were observed for fish fed diets containing 130 g kg−1 lipid diet. The results of this study showed that diet containing 420 g kg−1 protein and 130 g kg−1 lipid with a P:E ratio of 19.22 mg protein kJ−1 of gross energy is optimal for kutum fingerlings.
- Subjects
RUTILUS; PROTEINS; LIPIDS; ANIMAL nutrition; WEIGHT gain
- Publication
Aquaculture Research, 2013, Vol 44, Issue 9, p1447
- ISSN
1355-557X
- Publication type
Article
- DOI
10.1111/j.1365-2109.2012.03152.x