Abstract
Some farmers in Fillmore County, Minnesota, U.S.A., considered that contaminated well water was associated with lowered milk production in their dairy herds. Wells in shallow limestone-dolomite aquifers were easily contaminated by surface water. Fifty Dairy Herd Improvement Association dairies were classified by whether well water originated in deep, protected aquifers or in shallow, easily contaminated aquifers. No statistically significant differences in milk fat production were demonstrated between the two groups before or after the use of linear multiple regression models to control for differences in management practices.
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