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The objective of this study was to identify important effects of changes of in measures of performance for trends in profit score per cow per year in dairy herds. Data were Dairy Herd Improvement records from seven Midwestern states for 1,059 Holstein herds that had complete data for 5 consecutive years (1992-1996). Initially, estimates of yearly change for individual herds were computed for performance measures and estimated profit score. Measures included: calving interval; first calving age; days dry; days in milk; rolling herd average (RHA); services per conception; days to first breeding; and percentages of cows bred > 3X, open >120 d, in first lactation, dry > 70 d, dry < 40 d, with somatic cell counts > 400,000, and culled. To assess changes in performance measures, two different approaches were used: 1 ) herds with significant changes and 2) herds with consistent changes over a period of time. Based on this classification, the data set was divided into five subsets that were defined as herds with: 1) significant increases, 2) significant decreases, 3) no significant trend for profit score, 4) consistent increase, and 5) no consistent trend for profit score and included 19, 36, 1004, and 70 and 989 herds, respectively. Regression analyses were used to determine associations of changes for performance measures on changes for profit scores for each data subset. Means for

Relationships of Dairy Herd Improvement Association performance measures to profit score in dairy herds