Abstract
A method is presented for computing an index of herd udder health from a frequency distribution of milk somatic cell counts (SCC). The herd udder health index (HUHI) is a summation of weighted percentages of cows in SCC groups presented in Dairy Herd Improvement program monthly reports. Weights are the inverse of the ratio of the respective group SCC midpoint to that for the lowest SCC group. Values of HUHI approach zero from 100; an index of 100 represents a distribution in which the L 2 score for all cows tested was less than 2. For four dairies, coefficients of determination for HUHI and arithmetic mean SCC weighted by production ranged from 0.698 to 0.938.
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