POPULAÇÃO DE ENTEROBACTERIACEAE DO TRATO DIGESTÓRIO DE BEZERROS NELORE SUPLEMENTADOS COM ADITIVO MICROBIANO

The objective of this study was to characterize the population of Enterobacteriaceae present in the digestive tract of Nelore calves supplemented with microbial dditives. Sixteen Nelore calves, aged eight months, were evaluated. The experiment lasted 70 days, with 15 days of adaptation and was conducted in a 2x2 factorial scheme. One group was supplemented daily with a mixture of 160 mL of culture medium containing 4.4 x 108 CFU / mL of Aspergillus terreus and 2.0 x 108 CFU / mL of Trichoderma longibrachiatum mixed with 200g of the concentrate. Ruminal fluid and fecal samples were collected on the last day of the experimental period. The data was analyzed using SAEG. No significant differences were observed between the average concentrations of Enterobacteriaceae in ruminal fluid and feces of either supplemented calves or not, and the proportion of lactose fermenting bacteria (88%) was higher than non-fermentors (12%). The most isolated genus was Escherichia spp. (n=15). It is concluded that supplemented females presented lower concentrations of lactose non-fermenting bacteria in the ruminal fluid than in the control group.