Journal
AQUACULTURE
Volume 308, Issue 1-2, Pages 60-65Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aquaculture.2010.07.021
Keywords
Copper source; Performance; Copper status; Plasma antioxidant activity; Bioavailability; Carassius auratus gibelio
Categories
Funding
- Earmarked Fund for Modern Agro-industry Technology Research System (PRC)
- Heritage Micronutrients (USA)
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The experiment was conducted to compare the effects of dietary tribasic copper chloride (TBCC), copper amino acid complex (Cu-AA) and copper sulfate on performance, copper status and plasma antioxidant activities in crucian carp. Carassius auratus gibelio. fed a fish meal based diet. Two hundred and eighty crucian carps (18.10 +/- 0.04 g average body weight) were randomly assigned to 10 treatments. Treatments consisted of 0, 3, 6 or 9 mg supplemental Cu/kg from TBCC, Cu-AA or copper sulfate. Growth performance, copper status and plasma antioxidant activities were analyzed after a 55-day feeding period. Fish fed diets supplemented with copper at levels of 3-6 mg/kg had obviously higher WG and SGR (p<0.05) and relatively lower FCR (p>0.05) than fish fed the basal diet. Whole-body copper concentrations were significantly higher in fish fed diets supplemented with 3-9 mg Cu/kg (independent on copper sources) than fish fed the basal diet (p<0.05). There was a trend that fish fed diets with Cu-AA had higher liver copper than those fed diets with equal levels of copper from copper sulfate or TBCC (p>0.05). Fish consuming diets supplemented with 6 or 9 mg Cu/kg from Cu-AA, or 9 mg Cu/kg from TBCC had significantly higher ceruloplasmin activities than those fed diets with 3 mg Cu/kg from either TBCC or copper sulfate (p<0.05). GSH-Px activities were obviously higher in fish fed diets supplemented with 6 or 9 mg Cu/kg from copper sulfate than fish fed the basal diet (p<0.05). Using linear regression and a slope ratio technique, relative bioavailability values (RBVs) of TBCC were 1.18, 1.31 and 1.73, based on plasma ceruloplasmin, plasma copper and liver copper, respectively, and RBV of Cu-AA were 1.04, 1.00 and 1.42, compared with copper sulfate (1.00). This study showed that TBCC is more bioavailable to crucian carp than copper sulfate and could be used as a new copper source. (C) 2010 Elsevier B.V. All rights reserved.
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