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Letters to the Editor

Sees additional factors affecting milk production

I congratulate Dr. Lombard et al on their recent article titled “Risk of removal and effects on milk production associated with paratuberculosis status in dairy cows” (JAVMA, December 15, 2005, pp 1975–1981), based on data from the National Animal Health Monitoring System (NAHMS) Dairy 2002 Survey. Their findings were consistent with what one would have anticipated: that dairy cows with strong positive results for serum ELISA antibodies against Mycobacterium avium subsp paratuberculosis (MAP) produced less milk and were more likely to be removed from the herd within one