The objective of this study was to determine the nutritive values of some feeds from frogs diets, in a digestibility assay, using the forced feeding method, with 84 frogs at finishing stage (128,5 g ± 2 g) and 120 at initial stage (27,3 g ± 2 g), housed in metabolism cages. Forty frogs at initial stage and 28 at finishing stage were fasting, to determine the endogenous and metabolic losses. The values of apparent metabolizable dry matter (AMDM - %), apparent metabolizable energy (AME - kcal/kg), apparent metabolizable energy corrected by the nitrogen retention (AMEn - kcal/kg), true metabolizable energy (TME - kcal/kg) and true metabolizable energy corrected by the nitrogen retention (TMEn - kcal/kg) determined for the different ingredients, with frogs at the initial stage were: corn meal 55.70; 1842; 1798; 1948 and 1896; corn starch 49.60; 1553; 1524; 1634 and 1599; wheat meal 35.95; 1192; 1097; 1361 and 1256; soybean meal 76.97; 2856; 2405; 2965 and 2508; fish meal 55.16; 2288; 1915; 2386 and 1995 and meat and bone meal 29.63; 1683; 1418; 1765 and 1495, respectively. The values of AMDM (%), AME (kcal/kg), AMEn (kcal/kg), TME (kcal/kg) and TMEn (kcal/kg) determined withy frog at the finishing stage, for the different ingredients, were,: corn meal 58.44; 1934; 1893; 1971 and 1827; corn starch 73.03; 2132; 2085; 2175 and 2007; wheat meal 87.54; 2800; 2644; 2838 and 2602; soybean meal 71.50; 2718; 2284; 2754 and 2220; fish meal 60.24; 2266; 1817; 2347 and 1672 and meat and bone meal 59.01; 2080; 1835; 2113 and 1797, respectively.
bullfrog; digestibility; metabolizable energy; Rana catesbeiana
