Ciência Animal Brasileira (Jun 2011)
ALIMENTAÇÃO DE GIRINOS DE RÃ-TOURO COM DIFERENTES NÍVEIS DE PROTEÍNA BRUTA
Abstract
This study aimed at evaluating the performance of bullfrog tadpoles fed three levels of protein. Tadpoles were divided into 1 2 white boxes of polyethylene (62.5 x 40 x 16 cm) with a 40L capacity, which received 30L of water, receiving 30 animals, with average weight andlength of 0.027 ± 0.009g and 4.91 ± 0.45mm, respectively, resulting in a density of 1 tadpole per liter. As for feeding, commercial diets were used with three levels of crude protein (CP), 22%, 24% and 28%, with a 0.5 mm diameter, administered at a rate of 1 0% of tadpoles weight distributed once a day at noon. The experimental design was completely randomized with four replications. The best percentage of survival, 94.87%, was found in the 22% CP group. The other groups, with 24% and 28% protein, showed 81 .17% and 86.50% of survival rate, respectively. These results showed that the rations were not sufficient to provide a complete performance to the animals. Similarities regarding crude protein were observed until the 1 5th dayamong all the groups studied. However, there are some special physiological necessities, especially in relation to the protein intake, that were not well fulfilled despite the animals´good performance showed in this period.
