Evaluation of the efficacy of a feed additive to ameliorate the toxic effects of 4,15-diacetoxiscirpenol in growing chicks

Laboratorio de Toxicologia, Facultad de Medicina Veterinaria y de Zootecnia, Universidad Nacional de Colombia, Bogota, DC. dgjdiaz@veterinaria.unal.edu.co

The possible protective effect of a feed additive (Mycofix) against the toxic effects of 4,15-diacetoxiscirpenol (DAS) in growing broiler chickens was investigated in a 21-d fully randomized trial consisting of seven dietary treatments (control with no DAS or Mycofix added, 1 ppm DAS alone, 1 ppm DAS supplemented with 0.75 g/kg Mycofix, 1 ppm DAS supplemented with 1.5 g/kg Mycofix, 2 ppm DAS alone, 2 ppm DAS supplemented with 0.75 g/kg Mycofix, and 2 ppm DAS supplemented with 1.5 g/kg Mycofix). When no feed additive was included, both levels of dietary DAS significantly decreased BW and feed intake and caused oral lesions, with the effect of 2 ppm DAS being more severe. When 1 ppm DAS was added to the diet, supplementation of Mycofix protected against the adverse effects of DAS on feed intake and BW at both levels of inclusion (0.75 and 1.5 g/kg); however, no protection against oral lesions was obtained by Mycofix supplementation. This finding suggests that the adverse effect of DAS on performance is not due to the oral lesions per se but it is likely the result of the systemic absorption of the mycotoxin. When 2 ppm dietary DAS was present in the diet, only partial protection on BW and feed intake was obtained by Mycofix supplementation. More studies are required to determine if a higher dose of Mycofix could be capable of counteracting the adverse effects of 2 ppm dietary DAS on chicken performance.