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摘要
A exig那ncia proteica de alevinos de dourado foi avaliada por meio de dois ensaios, e as concentra es proteicas das dietas variaram de 32,29 a 57,63% no Experimento I e de 33,93 a 53,61% no Experimento II. O peso inicial dos alevinos foi de 0,75 e 5,68 g, para os Experimentos I e II, respectivamente. As dietas foram formuladas com ingredientes semipurificados e eram isoenerg谷ticas dentro de cada ensaio. Os peixes foram alimentados at谷 a saciedade aparente, duas vezes ao dia (9 e 16h), durante 29 dias no Experimento I e 94 dias no Experimento II. A an芍lise de regress o revelou aumento linear do ganho em peso com o aumento da concentra o proteica no Experimento I, indicando que a exig那ncia proteica de alevinos de dourado de 0,75 a 3,04 g foi de, pelo menos 57,6% de prote赤na bruta. J芍 no Experimento II, a concentra o proteica de 45,4% foi estimada como a exig那ncia diet谷tica para m芍ximo ganho em peso, pela an芍lise de regress o polinomial. The dietary protein requirement of dourado fingerlings was evaluated by two feeding trials where the crude protein concentrations varied from 32.29 to 57.63% in trial I, and from 33.93 to 53.61% in trial II. Fingerling initial weights were 0.75 and 5.68 g, for trial I and II, respectively. Experimental diets were formulated with semipurified ingredients and were isoenergetic within each feeding trial. Fish were fed to apparent satiation, twice a day (9 and 4 p.m.), for 29 days in trial I and 94 days in trial II. Regression analysis revealed a linear increase in weight gain as the dietary protein concentration increased in Trial I, indicating that the protein requirement of dourado fingerlings from 0.75 to 3.04 g is, atleast, 57.6%. In trial II, with bigger-size fish, 45.4% crude protein was estimated as the protein requirement for maximum weight gain by polynomial regression.
