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Article: Description of Herd Level Criteria for Good and Poor Udder Health in Norwegian Dairy Cows
- Article from:
- Journal of Dairy Science
- Article date:
- January 1, 2005
- Author:
CopyrightCopyright American Dairy Science Association Jan 2005. Provided by ProQuest LLC. (Hide copyright information)
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ABSTRACT
Data from the Norwegian dairy herd recording system were used to evaluate herd level criteria for good and poor udder health in dairy cows. All dairy herds with at least 10 cow-years were included (n = 12,780). The association between bulk milk somatic cell count (BMSCC) and clinical mastitis rate (CM) was weak (R^sup 2^ = 0.002), indicating that studies based on BMSCC provide different information regarding udder health than studies based on CM. The strongest correlations were found between average cow milk somatic cell count (CMSCC) and BMSCC and between percentage of individual cow milk sample >200,000 cells/mL and the variables BMSCC and CMSCC. A new variable called new ...