An experiment was carried out to evaluate the effècts of high and low levels of vitamins thiamine (B1) ribofiavin (B2) andpyridoxin (B3) on the performance of boilers. A total of 576 day old broiler chicks of both sexes was distributed in a trifactorial (23) completely randomized experimental desing, where two levels (high and low} of each vitamin were tested: vitamin B1 (A=3 mg/kg; B=2 mg/kg); vitamin B2 (A=6 mg/kg; B=4 mg/kg) and vitamin B6 (A=4,5 mg/kg; B=3 mg/kg). Therefore, eighteenth birds in each treatment (8), in four replications, were distributed in floor pens andreceived isonutritious diets, varying only in respect to the vitamins studied. Data were submitted to the analysis of variance and Tukey test. No significant differences (P>0.05) among treatments were observed for all parameters studied. Then, the results from this work suggest that the levels of vitamins B1, B2 and B6, for broilers, can be lowered to 66% of the usual levels actually used, without reduction in the performance of broilers.
broiler; pyridoxine; riboflavin; thyamine
