Christopher I. Vahl

Learn More
Violative drug residues in animal-derived foods are a global food safety concern. The use of a fixed main metabolite to parent drug (M/D) ratio determined in healthy animals to establish drug tolerances and withdrawal times in diseased animals results in frequent residue violations in food-producing animals. We created a general physiologically based(More)
OBJECTIVE To compare anamnestic antibody responses of dogs and cats with current versus out-of-date vaccination status. DESIGN Cross-sectional study. ANIMALS 74 dogs and 33 cats. PROCEDURES Serum samples were obtained from dogs and cats that had been exposed to rabies and brought to a veterinarian for proactive serologic monitoring or that had been(More)
OBJECTIVE To describe the incidence of specific causes of lameness and the associations of cause and severity of lameness on the outcome for cattle on commercial feedlots. DESIGN Dynamic population longitudinal study. ANIMALS Cattle on 6 commercial feedlots in Kansas and Nebraska during a 12-month period (mean daily population, 243,602 cattle; range,(More)
OBJECTIVE To describe the location and severity of deep digital flexor tendon (DDFT) lesions diagnosed by means of high-field-strength MRI in horses and to identify variables associated with return to activity following medical treatment. DESIGN Retrospective case series. ANIMALS 118 horses. PROCEDURES Medical records of horses with DDFT injury(More)
  • 1