Quirera de arroz em rações de juvenis de Jundiá (Rhamdia quelen), com ou sem suplementação de fitase

Abstract

The objective of this study was to evaluate different levels of broken rice in substitution of corn diets for juvenile silver catfish (Rhamdia quelen) with or without phytase supplementation. There were 360 silver catfish juveniles distributed in a completely randomized factorial design (2x5) (with or without phytase supplementation and with different levels of broken rice replacing corn (0, 25, 50, 75 and 100%) with three repetitions. Each experimental unit is composed by 12 fishes. At the end of the experiment (50 days), productive performance (weight gain, feed conversion, survival, specific length, condition factor and specific growth rate body compositions (moisture, ash, lipid and protein), morphometry of intestinal folds and muscle growth were analyzed. There were no significant difference (p>0,05) between the levels of broken rice replaced by corn with or without supplementation for productive performance, body composition variables, distribution frequency of fiber muscle and height of intestinal folds. However, regardless phytase supplementation or not, a linear reduction (p<0,05) of the intestinal folds was observed as the increase of the levels of corn substituted by broken rice. Is concluded that, the broken rice can replace up to 100% of corn in diets for R. quelen.