| prevalence of gastrointestinal parasites in working horses. | fecal samples for detection of gastrointestinal parasites were collected from 221 working horses from september 2002 to may 2003 from 14 villages in urmia, north west of iran. fecal samples of 46 horses (20.8%) were negative for parasite eggs or oocysts. one hundred and seventy five positive horses (48.9%) were infected with a single parasite type and 49 (22.2%) and 18 (8.1%) of horses had multiple infections with two and three parasites, respectively. the highest prevalence and intensity rate b ... | 2010 | 20731187 |