| epidemiology of abomasal nematodes of dairy cattle in hokkaido, northern japan. | the prevalence and intensity of infection with abomasal nematodiasis was studied in dairy cattle of hokkaido, northern japan, for successive two years. during the period of march in 1985 to september in 1987, a total number of 393 abomasa of holstein-friesian cows was examined for nematode parasites. nematodes were detected from 75% of the cows. the prevalence of nematode species detected was ostertagia ostertagi 250 (63.6%), mecistocirrus digitatus 181 (46.1%), trichostrongylus axei 85 (21.6%) ... | 1990 | 2348599 |