| epidemiology of ostertagia ostertagi in weaner-yearling cattle. | epidemiologic events in the life cycle of ostertagia ostertagi are best known in the weaner-yearling phase of cattle development throughout the concentrated cattle-rising areas of the world. animal and pasture management demands placed on this age class are greater than for suckling calves and adult stock in either beef or dairy breeds. this fact alone would likely account for a higher prevalence of clinical and subclinical disease in weaner-yearlings. additionally, the developing immune respons ... | 1993 | 8484223 |