Suplementação dietética de levedura de cerveja e de minerais orgânicos sobre o desempenho e resposta imune em frangos de corte desafiados com a vacina de coccidiose

Abstract

The objective of this study was to evaluate the effects of beer yeast and organic minerals supplementations on the performance, intestinal morphometry and humoral immune response of broilers that were challenged with coccidiosis vaccine. Three-hundred-eighty-four chicks were used, randomly distributed in an entirely random design total with four treatments (1. control, 2. organic minerals on top, 3. beer yeast, 4. association between organic minerals and beer yeast) and four treatments with 24- bird repetition each. At housing, 12 birds of each repetition were identified and received the eye-drop vaccine against coccidiosis. At 7, 21, 35 and 42 days it was collected blood to analyze the total serum proteins and the eletrophoretic profile of IgA and IgG and a duodenal segment for morphometric analysis. Neither the beer yeast nor the organic minerals supplementation affected the broiler performance or the antibodies production. The immunological challenge like the coccidiosis vaccine was not efficacious enough to provide an immune response able to modify the duodenal mucosa morphometry and the antibodies production.