Effects of dietary carbohydrate to lipid ratio on growth,feed utilization,body composition and digestive enzyme activities of golden pompano (Trachinotus ovatus) |
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| Authors: | L‐F Dong T Tong Q Zhang Q‐C Wang M‐Z Xu H‐R Yu J Wang |
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| Affiliation: | 1. Key Laboratory of Marine Biotechnology of Guangxi, Guangxi Institute of Oceanology, Beihai, China;2. College of Fisheries, Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, China;3. Key Laboratory of Biochemistry and Molecular Biology in Universities of Shandong (Weifang University), College of Biological and Agricultural Engineering, Weifang University, Tianrun Bioengineering R & D Center of Weifang New and High‐tech Zone, Weifang, China;4. Key Laboratory of Aquatic Product Processing, Ministry of Agriculture, South China Sea Fisheries Research Institute, CAFS, Guangzhou, China |
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| Abstract: | An 8‐week feeding trial was conducted to investigate the effects of dietary carbohydrate to lipid ratio (CHO: L) on growth, feed utilization, body composition and digestive enzyme activities of golden pompano, Trachinotus ovatus. Five iso‐nitrogenous (450 g/kg protein) and iso‐energetic (19 MJ/kg gross energy) diets with varying CHO: L ratios of 0.68, 1.02, 1.62, 2.61 and 4.35, respectively, were fed to triplicate groups of 30 fish (average 13.8 ± 0.1 g). Results showed that dietary CHO: L ratios did not show any significant influence on survival of golden pompano (p > .05) but significantly affected its growth performance and feed utilization (p < .05). Fish fed diets with CHO: L ratios at 1.62 and 2.61 exhibited the highest final body weight, weight gain ratio, specific growth rate, feed efficiency ratio and protein efficiency ratio. Fish body lipid and liver glycogen contents were also significantly influenced by CHO: L ratio (p < .05). Hepatic amylase activity increased firstly and then decreased as the dietary CHO: L ratio increased, while lipases activity decreased with increasing dietary CHO:L level. The regression model analysis showed that the most suitable dietary CHO: L ratio (protein 450 g/kg) to reach the highest weight gain ratio is 2.38. |
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| Keywords: | body composition carbohydrate to lipid ratio digestive enzyme activities feed utilization growth
Trachinotus ovatus
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