Body composition, growth performance, and product quality of rainbow trout (Oncorhynchus mykiss) fed diets containing poultry fat, soybean/corn lecithin, or menhaden oil
2004
Liu, K.K.M. | Barrows, F.T. | Hardy, R.W. | Dong, F.M.
The suitability of soybean/corn lecithin and poultry fat as partial replacements for menhaden oil in feeds for post-juvenile rainbow trout (initial weight 46.0 g) was investigated. For 16 weeks, fish were fed experimental diets in which either 10% menhaden oil (FO), 10% poultry fat (PF), 10% lecithin (soybean/corn, L10), or 15% lecithin (soybean/corn, L15), plus 5% supplemental menhaden oil was added to fish meal-based diets. There were no significant differences in body weight gain among all treatments (328-347 g/fish), although fish fed the L15 diet consumed significantly more feed (299 g/fish) than fish fed the PF diet (269 g/fish). Sensory analysis indicated that raw L10 fillets stored for 4 and 12 weeks at -20°C were significantly more yellow than raw FO fillets. Raw and cooked L15 fillets stored for 1 and 8 days at 5°C, or for 17 days, 4 weeks, and 12 weeks at -20°C had significantly higher colorimetric b* values (more yellow) than raw and cooked FO, PF, and L10 fillets. There was a trend for FO fillets to have higher TBARS values compared to fillets of the other treatments when stored under all time/temperature conditions tested. Although fillets of fish fed diets containing soybean/corn lecithin were more yellow in color, either lecithin (soybean/corn) or poultry fat was a nutritionally suitable substitute for most of the fish oil added to fish feeds.
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