Efeito da utilização de antioxidante no desempenho zootécnico de alevinos de piava (leporinus obtusidens)

Abstract

The objective of this study was to evaluate the effect of different inclusion levels of antioxidant in the diet of piava fingerlings (Leporinus obtusidens) on the zootechnical performance. The experiment was conducted for 28 days using a recirculating water system with thermoregulation. It was used 60 piava fingerlings, with 6 fingerlings for each experimental unit, which were randomly divided into 10 experimental units, divided into 5 treatments (T1 (without antioxidant inclusion), T2 (150g / t), T3 (300g / t), T4 (450g / t) and T5 (600g / t)) and two repetitions. The feeding was done twice daily (9 and 16 hours), the siphonage of solids residues were made before the feeding, resulting on a daily replacement of 5 to 10% water. The experimental design was completely randomized. The data were subjected to analysis of variance, and means were compared by Tukey test, both at the 5% level of significance. The piava fingerlings (Leporinus obtusidens) fed with the supplemented diet with 300g/t of antioxidant obtained higher zootechnical performance. The results obtained in the experiment showed significant differences (P <0.05) for the final average weight, average daily gain, total length, standard length and body condition factor. The results for carcass yield did not differ significantly among the treatments tested. It was concluded that the addition of antioxidant to a level of 300g/t in the diet of piava fingerlings (Leporinus obtusidens) improves the body growth and weight gain.