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Article

Calving ease (Co)variance components for a sire-maternal grandsire threshold model.

Journal of dairy science - 1 May 2003

Wiggans G R, Misztal I, Van Tassell C P

Abstract excerpt

Variance components for a sire-maternal grandsire (MGS) threshold model were estimated from subsets of the US calving ease (CE) database, which includes over 10 million calving records with CE scored 1 (no problem) to 5 (extreme difficulty). Selected records included sire and MGS among the 2601 most frequently appearing bulls. The data were further restricted by requiring at least 20 records in each herd year....

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Identifiers

PMID: 12778596
DOI: 10.3168/jds.S0022-0302(03)73771-0

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