Food Animal Practice
Think herd, not patient
Food-animal questions are usually population questions: incidence, attack rate, culling decisions, economics, and food safety. Know withdrawal times, residue avoidance, a valid VCPR, and AMDUCA extra-label rules (never permitted in feed; only under a valid VCPR with a veterinarian's order). Biosecurity, vaccination programs, and reportable diseases (brucellosis, tuberculosis, BSE, FMD, scrapie) recur on exams.
The fresh-cow differential
Master periparturient disease: milk fever (hypocalcemia - recumbent, cold ears, flaccid, Stage 1–3), ketosis (weight loss, ketonuria, propylene glycol), left displaced abomasum (ping on the left, reduced rumen motility), retained placenta and metritis, mastitis, and hypomagnesemia (tetany). Milk fever is treated with slow IV calcium borogluconate with cardiac monitoring; rapid infusion causes arrhythmia. The down-cow list also includes sciatic or obturator injury and selenium deficiency.
Small ruminants, swine, poultry
Small ruminants: pregnancy toxemia in late-gestation ewes carrying multiples (hypoglycemia - propylene glycol, often cesarean), hypocalcemia, foot rot, caseous lymphadenitis, OPP, bluetongue. Swine: PRRS, circovirus, erysipelas, mycoplasma pneumonia. Poultry: coccidiosis, Marek's disease, Newcastle disease, infectious bronchitis - vaccination and ventilation dominate.
Traps and worked example
A left ping is an LDA, not an RDA; a right ping suggests RDA, volvulus, or torsion. Oral antibiotics that disrupt rumen flora are a classic wrong answer. Example: a dairy cow 12 hours post-calving, recumbent, cold extremities, heart rate 50, no rumen motility - give calcium borogluconate IV slowly plus oral calcium gel; if she fails to stand, check for a concurrent LDA and ketosis.