Replacement of corn by rice grits, with or without phytase supplementation, in diets for silver catfish (Rhamdia quelen) juveniles
2020
Bentes, Victor Vicentin | Bittencourt, Fábio | Neu, Dacley Hertes | Signor, Altevir | Eyng, Cinthia
The replacement of corn by rice grits, at different levels (with or without phytase supplementation), in diets for silver catfish (Rhamdia quelen) juveniles was evaluated. We distributed 360 juveniles in a completely randomized 2 × 5 factorial design (with or without phytase supplementation and rice grit replacement levels of 0, 25, 50, 75 and 100 g/kg), with three repetitions. Each experimental unit was composed of 12 fish (approximately three months of age and an initial length of 17.60 ± 1.29 cm). At the end of the experiment (50 days), the productive performance (weight gain, feed conversion ratio, survival, specific length, condition factor and specific growth rate), body composition (moisture, ash, lipid and protein), muscle growth and morphometry of the intestinal folds were analysed. There was no interaction (p > .05) between the levels of rice grits and the supplementation or not of phytase for all parameters evaluated. However, regardless of phytase supplementation or not, a linear reduction (p < .05) in the height of intestinal folds was observed as the level of rice grits increased. We can conclude that the replacement of up to 100 g/kg of corn by rice grits can be used in diets for R. quelen regardless of enzyme supplementation.
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