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Revista Colombiana de Ciencias Pecuarias
Print version ISSN 0120-0690On-line version ISSN 2256-2958
Abstract
WEILER, Kátia A et al. Sunflower meal with and without phytase supplementation in diets for silver catfish (Rhamdia quelen) juveniles. Rev Colom Cienc Pecua [online]. 2019, vol.32, n.4, pp.285-297. ISSN 0120-0690. https://doi.org/10.17533/udea.rccp.v32n4a04.
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.
Keywords : aquaculture; aquiculture; alternative feed; diet supplementation; enzyme; fish nutrition; phytase; productive performance; Rhamdia quelen; silver catfish; sunflower meal.