A 5-month-old 172-kg (378-lb) female Brahman-cross calf was evaluated after a sudden onset of ataxia and possible blindness. The calf's dam was also reported to have developed acute blindness 2 days prior to the onset of clinical signs in the calf. However, the cow had escaped its holding pen, and its clinical status was not known.
Clinical and Gross Findings
At the evaluation, the calf was laterally recumbent and unresponsive. On physical examination of the calf, the menace reflex was absent bilaterally, and the cranial nerve and patellar reflexes were bilaterally hyporeflexive. The calf was treated with thiamine (10