trichostrongylosis

noun

tricho·​stron·​gy·​lo·​sis ˌtrik-ō-ˌsträn-jə-ˈlō-səs 

: infestation with or disease caused by roundworms of the genus Trichostrongylus chiefly in young sheep and cattle where it is commonly marked by diarrhea, inappetence, and loss of weight