Fauna and distribution of nematodes from the suborders spirurata and filariata parasitizing cattle in Dagestan, from the perspective of vertical zoning

Cattle of Dagestan are infested with several nematode species from the suborders Spirurata and Filariata, and extensiveness of the invasion depends greatly on the altitude above sea level. Level of infestation with Thelazia rhodesi, Th. gulosa, and Th. skrjabini is 38% in plains, 20% in submontane, and 5% in mountain zone. The same tendency is observed for the species Gongylonema pulchrum--45, 22, and 10%, respectively. Infestation with Setaria labiato-papillosa is 27.3% on average. Infestation with Onchocerca gutturosa and O. lienalis is 11% in plains and 3% in mountain and submontane zones; infestation with Stephanofilaria assamensis and S. stilesi in these zones is 18 and 5%, respectively. In mountain localities situated higher than 1000 m a. s. l. only G. pulchrum is occurred.