An epidemiological study on gastromtestinal tract nematodiasis of small ruminants in threerndifferent agro•ecologlcal zones of southern Ethiopia was carried out from August 2004 tornApril 1005 on 180 gastrointestinal tracts and 2, 28 faecal samples collected from sheep andrngoals to Identify nematode species. detennine the occurrence and factors related to thernnematode infection. The study w as carried out through post•mortem examInJtIon andrncoproJogicaJ examinations using floatation and McMaster egg counting methods.