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Effects of Dietary Carbohydrate-to-Lipid Ratios on Growth and Body Composition of Fingerling Channel Catfish
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1977
Year
NutritionSemipurified DietsExperimental NutritionBody CompositionBiochemical NutritionFeed AdditiveAnimal FeedPublic HealthAquatic Animal NutritionHealth SciencesAnimal PhysiologyIn Vitro FermentationDietary Carbohydrate-to-lipid RatiosAnimal NutritionFingerling ChannelFeed EvaluationLiver HistologyPhysiologyFeed IntakeChannel Catfish FingerlingsNutritional SciencesMetabolismMeat Science
Abstract Eight isonitrogenous, isocaloric semipurified diets were formulated with varying levels of digestible carbohydrate (white dextrin) and lipid (salmon-oil — corn-oil mixture) to determine the effect of each as energy sources for fingerling channel catfish (Ictalurus punctatus). After an initial 2-wk conditioning period, the experimental diets were fed in triplicate to groups of channel catfish fingerlings weighing 201 ±2 g per 110-liter flow-through aquarium. The diets were fed at a rate of 3% of the total wet weight of fish per day, divided into three equal feedings and adjusted weekly for 9 weeks. At the end of the feeding period no significant differences were observed in the growth rates, feed conversion, protein deposition, or energy retention of fish fed diets containing carbohydrate-to-lipid ratios (CHO:L) of 0.45 to 4.5. The observed effects of dietary CHO:L ratio on liver histology and on liver and carcass composition had no adverse effects on growth rates or feed conversion. These data indicate that digestible carbohydrates can be effectively used by channel catfish and can be substituted for lipids in semipurified diets at a rate commensurate with standard physiological fuel values of 2.25:1 within this CHO:L range.