A case report of Nerium oleander poisoning in cattle.

Nerium oleander leaves caused the death within 36 hours of 7 of 17 cattle which had access to boughs of the plant. Arrhythmia and auriculo-ventricular block at ECG were found in three cattle surviving on day 4. In one animal which died on day 4, postmortem examination revealed subendocardial and abomasal hemorrhages. Epidermic tissues of the leaves of N oleander were found in the rumen content. Recovery occurred in the three animals with marked cardiac signs.