1. Diagnosis of Johne's disease (paratuberculosis) in northern California cattle and a note on its economic significance;Abbas;California Vet,1983
2. 10.8% Johne's incidence in cull cows;Hoard's Dairyman,1983
3. Johne's disease in Wisconsin cattle-a survey of cull cows;Arnoldi,1983
4. Economic losses due to paratuberculosis in dairy cattle;Benedictus;Vet Rec,1987
5. Age and milk production data of cattle culled from a dairy herd with paratuberculosis;Buergelt;J Am Vet Med Assoc,1978