Progressive paresis in sheep due to delayed neurotoxicity of triaryl phosphates.

This report describes the history, signs, histopathology, and diagnosis of a delayed neurotoxicity in Suffolk sheep caused by transmission oil. The signs of toxicity included hyperexcitability, a stiff gait, tetraparesis and inability to maintain sternal recumbency. The circumstances involved in exposure to the transmission oil were determined. Histopathology revealed widespread degeneration of axons in the spinal cord, especially their more distal portions.