Long-term effects of antibiotics on Salmonella enterica in feedlot cattle

The objectives of this study are to determine the effects of ceftiofur and tulathromycin treatment on the population dynamics of Salmonella in feedlot cattle from early in the feeding period until slaughter. We are interested in determining the prevalence, quantity and proportion of MDR Salmonella in the feces, hides, and lymph nodes of cattle at slaughter