The Effect of Subclinical Mycobacterium paratuberculosis Infection on Milk Production in Michigan Dairy Cows

摘要

The objective of this study was to determine the effect of subclinical Mycobacterium paratuberculosis infection on mature equivalent milk, protein,, and fat production in a sample of Michigan dairy herds with a history of cows positive for M. paratuberculosis diagnosed by fecal culture. A prospective two-group cohort study was con - ducted. Participating herds were tested, and productiv - ity and reproduction records were monitored for 18 mo. All cows aged 24 mo and greater were tested for M. Paratuberculosis infection using the ELISA and radio - Metric fecal culture (RFC) techniques.