Article Text

Experimental induction of ovine polioencephalomalacia
  1. HJ Bakker,
  2. J Dickson,
  3. P Steele and
  4. MC Nottle


Polioencephalomalacia (PEM) was induced in sheep, with an overall incidence of 63 per cent, using local bracken fern (Pteridium esculentum) rhizomes as a source of thiaminase type 1 and pyridine as a basic cosubstrate. The condition was thiamin responsive and PEM was confirmed by histopathological examination. In a separate experiment to examine the effect of pyridine, it was shown that, for the duration of the experiment, pyridine had no toxic effect and caused no histologically detectable brain lesions.

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