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General passive hyperemia and numerous petechial and ecchymotic hemorrhages in the musculature, heart, thymus, and lungs were found.

Pathological effects of ammonia toxicity in sheep have been described… . The changes were similar when sheep received intraruminal injections of ammonium chloride, ammonium sulfate, or a mixture of ammonium chloride, carbonate, phosphate, and sulfate. General passive hyperemia and numerous petechial and ecchymotic hemorrhages in the musculature, heart, thymus, and lungs were found. The lungs were distended and severely congested. On microscopic examination, the pulmonary lesions included severe hyperemia, hemorrhage, alveolar edema, and alveolar emphysema. In the thymus, there was degeneration and necrosis of Hassall’s corpuscles and centrilobular hemorrhages. Lesions in kidneys included severe generalized cloudy swellings and multiple foci of early coagulative necrosis of the proximal convoluted tubules, general hyperemia of the glomerular tufts, and degeneration of the glomerular tuft cells.