Efeito das aflatoxinas e dos adsorventes sobre o desempenho zootécnico de alevinos e juvenis de jundiá (Rhamdia quelen).

• Autor(a) principal: Lopes, Paulo Rodinei Soares
• Data de Publicação: 2008
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UFPel - Guaiaca
• Texto Completo: http://repositorio.ufpel.edu.br/handle/ri/2627
• topic: Adsorvente; Aflatoxinas; Jundiá; Nutrição; Aluminosilicato; Glucomanano; Adsorbent; Aflatoxin; Rhamdia quelen; Nutriton; Aluminum-silicate; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA

Three experiments were carried out at the Ictyology Laboratory (Departamento de Zootecnia UFPel) to evaluate: a) - aflatoxin effects and b) - adsorptive action of 2 adsorbents (sodium and calcium aluminum-silicate and glucomanane) on growth and hematologic paramaters of jundiá (Rhamdia quelen) fingerlings, fed diets artificially contaminated. The first experiment consisted of 360 fingerlings (initial weight 4 g), raised during 90 days in thermo-regulated recirculation water system. Twelve treatments were compared, with 3 replications. Four levels of aflatoxin inclusion in diets (0, 150, 250 e 350 μgAFkg-1), with and without (0, 0.3 and 0,6%) adsorbent addition (sodium and calcium aluminum-silicate). Negative effect of aflatoxins significantly reduced (P<0.05) growth and weight gain of fingerlings, proportionately to increasing levels of aflatoxis in diet, without mortality occurrence. Adsorbent levels in diet did not diminish the effect of aflatoxins on fish performance. The second experiment evaluated the effect of aflatoxins and 2 adsorbents (sodium and calcium aluminum-silicate) on performance of 189 jundiá juveniles (initial weight 43.13 g),grown during 60 days. Nine treatments with 3 replications, 3 levels of aflatoxin inclusion in diet (0, 50, 100 μgAFkg-1) and 2 adsorbents (0.3%) were tested. Negative action of aflatoxins significantly reduced fish specific growth rate, proportionately to increasing levels of aflatoxins in diet, without mortality occurrence. Only the addition of glumanane to diet significantly (P<0.05) neutralized the negative effects of aflatoxins, in relation to the contaminated group. The third experiment evaluated aflatoxin effects on erythrocytic parameters of jundiá juveniles fed diets with different concentrations of aflatoxins (0, 150, 250 e 350 μgAFkg-1), during 90 days in a thermo-regulated recirculation water system. It was observed that increment of aflatoxin levels in diet significantly reduced hematocrit rate and hemoglobin. Jundiá juveniles fed diets with aflatoxin are susceptible to negative effects, presenting losses in growth, weight gain and reduction of erythrocytic parameters. Addition of 0.3% of glucomanane in diet diminishes the action of aflatoxins on jundiá juveniles.