NAVLE Practice — Bovine (DEMO)

A group of cows is turned onto a lush alfalfa pasture; within an hour one cow is dyspneic and anxious with marked distension of the entire left flank that is tympanic on percussion, and a stomach tube passed into the rumen releases little gas. Which is the most likely diagnosis?

A mature cow fed corn silage develops depression, a head tilt with circling to one side, drooping of one ear and eyelid, and drooling from one side of the mouth; she is afebrile-to-mildly febrile and continues to try to eat. Which is the most likely diagnosis?

Several cattle are found dead near a fertilized, drought-stressed forage field; survivors are weak and dyspneic with muddy-brown mucous membranes, and a blood sample drawn from an affected animal is chocolate-brown. Which is the most likely toxicosis?

The largest, fastest-growing calves on a lush ration are found dead without warning; a few show sudden neurologic signs and convulsions before death, and postmortem reveals pulpy kidneys and glucosuria. Which is the most likely diagnosis?