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BIG-HEAD
1. In horses, generally denotes osteodystrophia fibrosa.
2. Gas gangreneinfection of tissues of the head, caused by Clostridium novyi in sheep, generally young rams with head wounds.
3. Photosensitization in sheep.
4. An acutemalady of young rams caused by the Clostridium novyi, C. Sordellii or, rarely, C. Chauvoei and characterised by a nongaseous, nonhemorrhagic, edematous swelling of the head and neck.