Sunflower meal with and without phytase supplementation in diets for silver catfish (Rhamdia quelen) juveniles

• Autor(a) principal: Weiler, Kátia A.
• Data de Publicação: 2019
• Outros Autores: Pessini, Jhonis E., Sanchez, Milena S S., Rodrigues, Mariana L., Boscolo, Wilson R., Pezzato, Luiz E. [UNESP], Bittencourt, Fábio, Signor, Altevir
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.17533/udea.rccp.v32n4a04; http://hdl.handle.net/11449/198099
• topic: Alternative feed; Aquaculture; Aquiculture; Diet supplementation; Enzyme; Fish nutrition; Phytase; Productivperformance; Rhamdia quelen; Silver catfish; Sunflower meal

Background: The cost of feed in fish farming can exceed 70% of the total costs. Thus, the feed industry have sought to formulate balanced diets including low-cost by-products. Objective: To evaluate sunflower meal as a partial substitute (0, 10, and 20%) for soybean meal, with or without phytase supplementation (1,500 FTU/kg) in isoproteic (27% crude protein (CP)) and isoenergetic diets (3,400 kcal/ED/kg of feed) for silver catfish (Rhamdia quelen) juveniles. Methods: A total of 360 fish (weight: 15.77 ± 0.56 g) were randomly distributed in 24 tanks in a completely randomized design following a factorial scheme (3x2) with 4 replicates. The fish were evaluated on the following variables after 90 days: productive performance, hematological variables, histology of intestinal tissue, bromatological composition of carcass, and composition of bone mineral matter. Results: 20% dietary inclusion of sunflower meal improved weight gain and protein efficiency. No difference was observed in the other treatments and no interactions were observed between the other factors. Conclusion: 20% sunflower meal can be included in the feed of silver catfish as a substitute for soybean meal. Phytase inclusion (1,500 FTU/kg) did not improve the nutritional value of the treatments.