members of the genus gongylonema  are nematodes that commonly infect ruminants, particularly sheep and goats. an 11-year-old donkey mare was referred to the veterinary teaching hospital, school of veterinary medicine, ferdowsi university of mashhad, mashhad, northeastern iran, with a history of acute colitis. at post-mortem examination, there were several white to pink zigzag tracks in the muco...