A trial was carried out to study isolated or combined effect of Apramicin (10ppm) and formic + propionic acids (0.0; 0.1 and 0.2%) supplementation in broilers diets. Acids mixtures were blended in a 1:1 ratio. A completely randomized design was utilized in a 2 x 3 x 2 factorial scheme (apramicim x organic acids x sex) with 4 replicates of 45 birds per experimental unit, with 2160-day-old Cobb chicks. Birds were fed "ad libitum". In the initial phase, the supplementation of apramicin and organic acids (0.1%) alone, increased (p<0,05) body weight gain. Combined supplementation did not promote an accumulative effect. However, apramicin in the presence of organic acids supplementation decreased feed efficiency. In the final and total phases, broilers performance parameters were not affected by treatment. Combined supplementation of apramicin and organic acids (0,1%) decreased carcass yield.
propionic acid; formic acid; apramicin; broilers chicken; growth promoter
