Objectives: A farmer who has no skill in sheep husbandry, merely for economic profits, used leaves of pine trees for feeding of the sheep. According to the available resources, this is the first report of pine poisoning in sheep in Iran and possibly in the world. The aim of this paper is explaining the clinical signs of pine poisoning and reminding of this key point “due to the similarity of clinical symptoms of poisoning with other diseases, recognizing and observing of poisonous agent in the environment has an important role in definitive diagnosis of the poisoning’. Materials & Methods: In late winter,1390, one head of one year ram with the sign of lethargy, anorexia, paresis, head tremor and falling was referred to the teaching hospital of ferdowsi university, faculty of veterinary medicine. 3 out of 11 heads were died with the same signs during a period of 3 weeks. In clinical examination, pallor of mucous membranes, weak or absence of menace reflex in either two eyes, tachycardia, decreasing of frequency and strengths of rumen movements, harsh sound in lungs and groan expiratory were revealed. For further investigations, two blood samples were taken for haemogram and measuring some biochemical parameters. Results & Conclusion: In spite of careful clinical and paraclinical examinations, because the farmer was not reported the using of pine leaves in feeding of his sheep, primarily, the definite diagnosis of the disease was very difficult. But by observing the pine trees in his vehicle, the definite diagnosis was possible. In biochemical profile of serum, anemia, hyperglycemia, hypocalcemia, hypophosphatemia ,decreasing of creatinine and BUN were detected. The autopsy could not provide, but the farmer recorded some abnormalities in the lungs of dead sheep. The pine tree is an evergreen plant with many various compounds. Its oral consumption can cause swelling of digestive system mucosa, abortion and respiratory distress. In this paper, in addition to interpretation of all findings, the pine toxicity has been discussed. It should be noted, by taking the pine from the sheep diet and common supportive treatments, no other losses was observed.

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