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Title: Apparent digestibility coefficients of brewer's by-products used in feeds for rainbow trout (Oncorhynchus mykiss) and gilthead seabream (Sparus aurata)
Authors: Nazzaro, J.; San Martin, D.; Perez-Vendrell, A. M.; Padrell, L. and Inarra, B.; Orive, M.; Estevez, A.
Abstract: A trial was conducted to test the effect of partial replacement of fishmeal by two brewery industry byproducts, yeast and spent grain, included in isoproteic (41\% CP) and isolipidic (22\% CL) diets for gilthead sea bream (Sparus aurata) and rainbow trout (Oncorhyncus mykiss), having in mind the availability of these byproducts. A first step before an ingredient is included in a commercial feed is to evaluate the nutritional quality of these raw materials by measuring their digestibility. Thus, the apparent digestibility coefficients of the diets and ingredients were determined after a 30 days feeding trial and faecal collection. Apparent digestibility coefficients of these by products in the case of rainbow trout varied between 75 and 88\% whereas for gilthead seabream was between 71 and 88\%. According to the results obtained, the inclusion of 20-30\% of brewers' spent yeast and spent grain in the feed for carnivorous fish either from fresh (rainbow trout) or marine (gilthead seabream) gave similar results to a feed with fish meal as the main protein source and show a good protein, lipid and amino acid digestibility. Taking into account that these by-products are produced in large quantities in Europe, they can be a potential source of protein to reduce the use of plant proteins or fish/animal byproducts (trimmings) and increase the sustainability of both sectors, brewery industry and aquaculture.
Keywords: SPENT GRAIN; PRACTICAL DIETS; PLANT-PRODUCTS; SOYBEAN-MEAL; FISH-MEAL; YEAST; REPLACEMENT; AQUACULTURE; BARLEY; GROWTH
Issue Date: 2021
Publisher: ELSEVIER
Type: Article
Language: 
DOI: 10.1016/j.aquaculture.2020.735796
URI: http://dspace.azti.es/handle/24689/1290
ISSN: 0044-8486
E-ISSN: 1873-5622
Funder: LIFE European Environment Programme, the EU's financial instrument supporting environmental, nature conservation and climate action projects throughout the EU [LIFE16ENV/ES/000160]
Appears in Publication types:Artículos científicos



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