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Association of Herd Means and Variances is a Function of Edit for Minimum Lactation Length

Department of Economics, University of Queensland, St. Lucia, Queensland 4067, Australia

ABSTRACT

Association between herd sample means and herd sample standard deviations for milk yields can be induced by the management practices of culling and selection. This association can be enhanced further by data preparation such as editing short lactations or lactations with low yields. The nature and strength of association in dairy data might be an artifact of editing, selection, and culling rather than evidence that herd yield has a multiplicative effect. This feature of the edited data set must be considered in evaluating analyses, particularly when herd statistics are used to "standardize" production environments.