Substituição da proteína do farelo de soja pela proteína do farelo de canola em rações para alevinos de curimbatá (Prochilodus lineatus V.)

Abstract

The influence of the substitution of soybean meal protein (SM) by canola meal protein (CM) in Prochilodus lineatus fingerling diets was verified. One hundred and twenty specimens, averaging weight 1.88±0.82g and total length 5.40±0.99cm, was assigned to a completely randomized randomized design, with six treatments and four replicates, in a 50 L glass aquarium, with five fingerlings in each experimental unit. Isoprotein (26.00%), isocalcium (0.90%) and isophosphorus (0.70%) diets were formulated with increasing replacement levels of SM protein by CM protein (0.00, 20.00, 40.00, 60.00, 80.00, and 100.00%). Values correspond respectively to 0.00, 8.03, 16.10, 24.10, 32.15 and 43.12% of CM inclusion in diets for 30 days. Physical and chemical parameters of water were measured every seven days. Through an increase in CM inclusion in diets, a linear decrease in weight gain and protein efficiency rate was reported; a linear increase in food conversion has also been recorded. There was no influence of CM inclusion in diets on survival rate and feed costs/kg gained. Water temperature, pH and electrical conductivity remained within proper limits. Increase in levels of protein inclusion of CM in diets for Prochilodus lineatus fingerlings caused a decrease in their performance.