The Effect of subsp. Infection on the Productivity of Cows in Two Dairy Herds with a Low Seroprevalence of Paratuberculosis.

Paratuberculosis is a chronic, progressive enteritis of ruminants, caused by subspecies . It affects the productivity of infected dairy cows, causing a reduction in the daily milk yield and basic milk components. The aim of the study was to determine the effect of subspecies on the productivity of dairy cows in two herds.