Seven fish oil substitutes over a rainbow trout grow-out cycle: II) Effects on final eating quality and a tentative estimation of feed-related production costs

Autor: F. Caprino, Vittorio Maria Moretti, Karen Hermon, Giovanni M. Turchini, T. Rankin, M.L. Busetto, David S. Francis, Federica Bellagamba
Rok vydání: 2013
Předmět:
Zdroj: Aquaculture Nutrition. 19:95-109
ISSN: 1353-5773
DOI: 10.1111/anu.12045
Popis: The effects of seven alternative oils on final product quality and production cost were assessed in rainbow trout (Oncorhynchus mykiss). The tested oils were as follows: monola (a high oleic acid canola cultivar; MO), canola (rapeseed; CO), poultry by-product (chicken fat; PbPO), palm (PO), sunflower (SFO), high oleic acid sunflower (HOSFO) and soybean (SBO). Tested oils were included at a 75% substitution level of fish oil and were compared with a control diet containing 100% fish oil (FO). Fillets of trout fed FO contained a 2.8-fold higher amount of EPA + DHA in comparison with fish fed the alternative oils, whilst the n-6/n-3 ratios varied from 0.2 in FO to 3.67 in SFO. Fillet pigmentation was highly affected by the different dietary treatments, as was the refrigerated product shelf-life. Fillets of trout fed FO recorded significantly higher lipid peroxidation at days 6 and 9 of refrigeration compared with the other treatments. The fillet flavour volatile compounds were significantly affected by the treatments, but no differences were detected by the panellists in the sensorial analysis. A discrepancy between production costs at ‘feed mill’ or ‘on-farm’ was recorded, suggesting that FO replacement may result in no real economic benefit.
Databáze: OpenAIRE
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