Abstract
This study aimed at evaluating the performance of bullfrog tadpoles fed three levels of protein. Tadpoles were divided into 12 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 and length 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 10% 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 15th day among 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.KEYWORDS: frog culture; performance; protein; tadpoles.
Highlights
This study aimed at evaluating the performance of bullfrog tadpoles fed three levels of protein
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
Regarding crude protein were observed until the 15th day the protein intake, that were not well fulfilled despite the among all the groups studied
Summary
This study aimed at evaluating the performance of bullfrog tadpoles fed three levels of protein. 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. BARBOSA et al (2005) concordam que a alimentação de girinos em sistema de criação comercial é de fundamental importância, não só em termos de quantidade, como de qualidade; porém, os autores mencionaram que os trabalhos encontrados na literatura acerca de níveis nutricionais e suas relações com o crescimento são escassos. Os mesmos autores observaram que girinos alimentados com dietas com alto teor de PB (46,5%) apresentaram melhor desempenho e crescimento heterogêneo mais elevado, e que níveis protéicos entre 26,6 e 33,6% são adequados ao desenvolvimento dos girinos. Objetivou-se com este estudo avaliar o desempenho de girinos da rã-touro alimentados com diferentes níveis de proteína
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