Energia digestível de diferentes fontes de glicerol para a tilápia-do-nilo (Oreochromis niloticus)

Abstract

Glycerol is a biodiesel industry byproduct and it can provide energy for animals when included in diets. This study was carried out to determine the digestible energy values of different sources of glycerol for Nile tilapia. Forty fish weighing, in average, 343.1 ± 77.7 g were distributed in four 180 liter tanks with a conned bottom, in a randomized Latin Square Design. Four experimental diets were prepared: one reference and three test diets containing 20% of the test meal and 80% of the reference diet. Chromic oxideIII was used as indicator (0.1% diet). The glycerol sources evaluated were: crude vegetable oil glycerol (GBV); semi-purified mixture glycerol (GSM); and semi-purified vegetable glycerol (GSV), in which the digestible energy values of 3058; 2610 and 1754 kcal kg-1 were obtained, respectively, without differences between the digestible energy of glycerol GBV and GSM, which were higher than GSV.