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- Title
Dietary copper requirement of fingerling Channa punctatus (Bloch) based on growth, feed conversion, blood parameters and whole body copper concentration.
- Authors
Abdel‐Hameid, Nassr‐Allah H; Zehra, Seemab; Khan, Mukhtar A
- Abstract
A 12-week feeding trial was conducted to estimate the dietary copper requirement of fingerling Channa punctatus. Six casein−gelatin-based test diets (450 g kg−1 crude protein; 18.81 kJ g−1 gross energy) with graded levels of copper as copper sulphate (3.7, 4.7, 5.7, 6.7, 7.7 and 8.7 mg copper equivalent kg−1 diet) were formulated and fed to triplicate groups of fish (7.25 ± 0.81 cm; 5.21 ± 0.27 g) near to satiation. Fish fed diet with 6.7 mg kg−1 copper had highest absolute weight gain ( AWG; 51.63 g fish−1), protein efficiency ratio ( PER; 1.42 g fish−1), protein gain ( PG; 8.34 g fish−1), haemoglobin (Hb; 9.68 g dL−1), haematocrit (Hct; 31.18%) and RBCs (3.24 × 106 × mm−3). Feed conversion ratio ( FCR) was found to be best (1.57) at above level of dietary copper. Whole body copper concentration was found to increase with the increasing levels of dietary copper. Hepatic thiobarbituric acid-reactive substances concentration was found to decrease with increasing dietary concentrations of copper up to 6.7 mg kg−1 beyond which a reverse trend in this parameter was noted. Broken-line regression analysis of AWG, FCR and PG concentrations against varying levels of dietary copper yielded the requirement in the range of 6.66-6.78 mg kg−1. Data generated during this study would be useful in formulating copper-balanced commercial feeds for the intensive culture of this fish.
- Subjects
CHANNA; COPPER in animal nutrition; FEED utilization efficiency; STIMULUS satiation; THIOBARBITURIC acid test
- Publication
Aquaculture Research, 2017, Vol 48, Issue 6, p2787
- ISSN
1355-557X
- Publication type
Article
- DOI
10.1111/are.13112