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Effect of herdsize on phenotypic variances for mature equivalent milk of first lactation cows






Journal of Dairy Science 75(Supplement 1): 245

Effect of herdsize on phenotypic variances for mature equivalent milk of first lactation cows

In genetic evaluations genetic variance is standardized based on phenotypic variance. Currently, within-herd variances are regressed toward regional means. Herd size was studied as a predictor of phenotypic variance. Phenotypic variances were computed for mature-equivalent milk using data from 600 000 1st-lactation cows calving in 1990. Herd sizes varied from 10 to 1067 1st-lactation cows. Variance tended to increase with herd size. S.d. ranged from 1377 to 1781 kg.

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Accession: 002356514



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