The Collaborative International Dictionary of English v.0.48:

locoism \locoism\ n.
   a disease of livestock caused by locoweed poisoning;
   characterized by weakness and lack of coordination and
   trembling and partial paralysis.

   Syn: loco disease.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

locoism
    n 1: a disease of livestock caused by locoweed poisoning;
         characterized by weakness and lack of coordination and
         trembling and partial paralysis [syn: loco disease,
         locoism]