Figure 2. Soil mircoflora is responsible for degradation of ceftiofur metabolites.

Effect of autoclaved (AC) vs. non-autoclaved (non-AC) soil and feces on ceftiofur metabolites (CFM) as measured by recovery of growth for E. coli K-12 (D₅₀). Sandy soil was used and chambers were incubated at 4°C. Main effects (soil and feces) were significant (P<0.0001). Letters designate group differences based on Tukey-Kramer multiple comparison test (P<0.001). Bars = s.e.m.