Research-ArticleSelection Indices for Milk and Fat Yield of Holstein-Friesian Dairy Cattle
Review articleOpen access
Abstract:

SummaryEstimates of heritability, phenotypic and genetic correlations for milk and fat yield and fat per cent were obtained from the single lactation records of 20,024 daughterdam pairs of the Holstein-Friesian breed. The estimates of these parameters were used to construct selection indices for milk and fat yield. The results indicated that a selection index for milk yield alone would be expected to be the most effective in improving milk and fat yield of dairy cattle.

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