Journal
JOURNAL OF DAIRY SCIENCE
Volume 94, Issue 6, Pages 2825-2831Publisher
ELSEVIER SCIENCE INC
DOI: 10.3168/jds.2010-3665
Keywords
dairy cow; Mycobacterium avium ssp paratuberculosis; case-control study; Johne's disease
Funding
- USDA/APHIS
Ask authors/readers for more resources
A case-control study was performed to determine if dairy heifers testing positive for Mycobacterium avium ssp. paratuberculosis (MAP) before 2 yr of age by either fecal culture or serum ELISA had decreased productivity and longevity as cows compared with age-matched herdmates. Cases were individually matched with 4 controls. Survival analysis was conducted to determine differences in longevity between cases and controls. Conditional logistic regression was used to assess differences in mean 3.5% fat-corrected 305-d mature-equivalent milk, milk fat, and milk protein production, linear somatic cell count, and MAP test and clinical status as mature cows. No significant difference was found between cases and controls for any parameter assessed. Herd production performance and longevity did not appear to be impaired; therefore, testing immature dairy heifers for MAP is not economically justifiable, using currently available culture methods and commercial serum ELISA tests.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available