Objective.

Evaluate the use of probiotics in diets whit ingredients of animal or vegetable origin in production variables of broilers from 1 to 42 days of age.

Materials and Methods.

Were used 1056 one-day-old chicks, male, of lineage Ross 308, divided in to an experimental randomized design in 2X4 factorial arrangement, two origin of diet (animal or vegetable) and four promoters (antibiotic, two probiotics and a negative control) whit 6 replicates and 22 birds per unit.

Results.

At 7 days old there was a difference (p<0.05) in daily food intake, weight and weight gain and 14 days for weight, weight gain and mortality among diets. The feed conversion of 1-7 days did interaction (p<0.05) between types of diet and promoters. There was a difference (p<0.05) for weight and weight gain at 14 days of age between promoters. At 21 days of age presented mortality difference (p<0.05) for the type of diets; weight, weight gain, daily feed together and feed conversion showed difference for developers. At 28, 35 and 42 days old mortality and productive efficiency index showed difference (p<0.05) between the types of diets.

Conclusions.

The type of diet and growth promoter did not affect production variables, however, the viability improvement animal diets.

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