EFEITO DO MÉTODO DE COLETAS DE FEZES DE TAMBAQUI (Colossoma macropomum), SOBRE A TAXA DE LIXIVIAÇÃO .

Abstract

The evaluation of foods is one of the necessary prerequisites for the construction of a database used in the development of economically viable and that have diets low environmental impact. Digestibility is one of the ways to determine the nutritional value of food, however the choice of method of collecting appropriate stool is directly related to the accuracy of the data produced. Thus, the present study aimed to evaluate the effect of feces collects method, on the rate of leaching of nutrients in the water, so as to determine the best time for collects feces s Tambaqui (Colossoma macropomum) digestibility was estimated by indirect method in Guelph system using modified chromium oxide as inert marker, the concentration of 0.2%. The ranges correspond to collects to 60 min, 120 min, 240min, and 480 min. 64 juvenile tambaqui were used with an average weight of 300 g randomly distributed in eight power tanks with a capacity of 310L of water. The collects were made during four weeks, where each week was considered one repetition. And the determination of the chromium concentration and rations of feces were held at the Department of Animal Production (DPA/EV/UFG). After determination of the concentrations of chromium and phosphorus in animal feed and feces, MS CDAs and P were determined. The experimental design was entirely chance, with four treatments and four repetitions. Stool collection interval for the tambaqui digestibility values influence of dry matter and phosphorus. However, higher digestibility values were observed for the match after 240 and 480 min., while the smallest value of CDA was noted for the range of 120 min. one can conclude that in Guelph s collects method modified the collects intervals of feces for determination of the CDA of P and MS are different, being necessary the realization of collects an hour after the elimination of feces in order to reduce leaching of P in water bodies While for the smallest variation in CDA values of MS recommends that collects are performed in two to eight hours after the start of the release of stool.