Effects of pathogen-specific clinical mastitis occurrence in the first 100 days of lactation 1 on future mastitis occurrence in Holstein dairy cows: An observational study

Abstract

Graphical Abstract Summary: This study estimated the effects of pathogen-specific clinical mastitis (CM) occurring in the first 100 days of lactation 1 on the future occurrence of pathogen-specific CM in 14,440 Holstein cows in 5 New York herds. Cows were followed from lactation 1 calving date until death or sale. Generalized linear mixed models were fit. Clinical mastitis cases due to Escherichia coli or with no growth in the first 100 days were the most important predictors of future occurrence of pathogen-specific CM. The findings may help farmers foretell which cows that have CM in early productive life may have future cases.