Desempenho de girinos de rã-touro alimentados com ração comercial contendo diferentes concentrações de proteína bruta RESUMOObjetivou-se avaliar o desempenho de girinos da rã-touro (Lithobates catesbeianus Shaw, 1802), alimentados com diferentes níveis de proteína bruta. Foram utilizados 360 girinos de mesma desova, no estádio 25 de Gosner e distribuídos à base de um girino/L em caixas contendo 30L de água. As características e a sobrevivência foram avaliadas em cinco biometrias, durante 60 dias. O delineamento experimental foi o inteiramente casualisado, com parcela subdividida com quatro repetições. O peso médio dos animais e o ganho de peso, até 30 dias de experimentação, não foram influenciados pelos teores de proteína bruta na ração. O peso médio dos girinos atingiu valores máximos aos 60 dias de experimentação de 13 gramas quando a ração com 45% de PB se destacou das demais. O ganho de peso apresentou valor máximo aos 46, 48, 53 e 60 dias quando foram utilizadas as rações com 32, 36, 45 e 55%, respectivamente, indicando que quanto maior o teor de PB, mais tardia deverá ser a intervenção na dieta. O comprimento dos girinos aumentou de forma contínua à medida que elevou-se a porcentagem de proteína na ração. Palavras-chave:Comprimento, exigência nutricional, metabolismo, peso médio Bullfrog tadpoles performance fed commercial ration with different crude protein levels ABSTRACTThe objective of this work was to evaluate the performance of bullfrog tadpoles (Lithobates catesbeianus Shaw, 1802) fed different dietary crude protein levels. Three hundred and sixty tadpoles of the same spawning were used, at Gosner stage 25, and distributed based on one tadpole/L in boxes containing 30L of water. The parameters and survival were evaluated in five biometries for 60 days. The experimental design was completely randomized, with four replications. Animals average weight and weight gain by 30 days of the experiment were not influenced by crude protein in the diet. The mean weight of tadpoles peaked at 60 days of trial of 13 grams when the diet with 45% of CP was distinguished from the others. Weight gain showed maximum value at 46, 48, 53 and 60 days when rations were used with 32, 36, 45 and 55% respectively, indicating that the higher the CP, the later should be the dietary intervention. Tadpoles length grew steadily as the percentage of protein in the diet increased.
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