The experiments were conduct in order to evaluate the nutrients apparent digestibility coefficients and gross energy and performance assay by using the acid silage from tilapia filetage residues of Nile's tilapia (Oreochromis niloticus) for frog-bull tadpoles (Rana catesbeiana) using increasing levels (0, 15, 30%) of acid silage residues in substitution to the fish meal in the ration of frog-bull tadpoles. For the digestibility assay were utilized 200 tadpoles, measuring on an average 7 cm, packed in aquaria of 40 liters. The feces collection was made in 7 days and the coefficients apparent digestibility of nutrients and energy digestible determination were made by indirect methodology and using 1,0% of Cr2O3 as diet indicator. In the performance assay a total of 240 tadpoles were utilized , with middleweight of 2,5 g packed in aquaria of 40 liters. The variables analyzed were: weight gain (WG); total feed intake (TFI); and apparent feed conversion (AFC). The experimental was in the entirely randomized design, with 3 treatments and 16 repetitions. The digestibility values were: Apparent coefficient of Dry Matter 95.48; Apparent coefficient of crude protein 95.90; Apparent coefficient of ethereal extract 99.25; Apparent crude energy digestibility coefficient 95.75 and digestible energy (kcal DE / kg) 2418. The results shown linearly decreased (P<0,01) for the weight gain and feed intake. It was conclude that the acid silage from tilapia filetage residues shown low performance, therefore high nutrients digestibility of diets for bull tadpoles (Rana catesbeiana).
Tadpoles; digestibility; performance; filetage of tilapia; silage acid
