PRODUTOS DERIVADOS DE LEVEDURA DIMINUEM AFECÇÕES RESPIRATÓRIAS E MELHORAM A SAÚDE DE NOVILHOS CONFINADOS

Abstract

In order to evaluate if the administration of two presentations of Saccharomyces cerevisiae improves the health of feedlot finished steers, 33 ½ blood Angus-Nelore steers (350 ±10 kg body weight and 11± 5 months old) fed an energy diet were evaluated at the beginning (0 and 16 days), middle (44 and 72 days) and end (100) of feedlot by means of leukocyte oxidative metabolism, inflammatory status, health of the respiratory tract and histomorpology of the rumen and intestine. Steers that received Saccharomyces cerevisiae as culture (n=12) showed an average 7% increase in neutrophil oxidative metabolism, lower indicators of respiratory disease and lower inflammatory status in the intermediate and final phase of feedlots. Similarly, the calves that received S. cerevisiae in autolysed form (n=10) had 10% increase in neutrophilic oxidative metabolism and lower inflammatory status in the intermediate and final phase of the feedlot but presented more indicators of respiratory diseases than the first treatment. Although this presentation also acted on rumen papillae, its action was tenuous, minimizing only the rumenitis score, but not preventing the keratinization of rumen papillae. We conclude that both presentations of S. cerevisiae increased the health of animals in relation to the control group (n=11), highlighting the supplementation with culture of S. cerevisiae, which resulted in less alteration of rumen papillae compatible with lower occurrence of ARDS, better results of the immune system and lower occurrence of CRB.