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Article

Short communication: Trends for monthly changes in days open in Holsteins.

Journal of dairy science - 1 Sept 2009

Pszczola M, Aguilar I, Misztal I

Abstract excerpt

A reaction norm approach was used to estimate trends for days open (DO) with a model that indirectly accounted for heat stress. Data included 3.4 million first-parity records of DO of US Holsteins. A fixed effect model included herd-year, month of calving within region (MOC), age class, and regression on 305-d milk yield. An index calculated from the standardized solutions to MOC derived from the fixed effect...

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Identifiers

PMID: 19700733
DOI: 10.3168/jds.2008-1985

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PubMed metadata and Literature Corpus relationships. Corpus snapshot updated 7 Sept 2026. Manifest publication-graph-cohort-2026-09-08.1.

Source receipt: pubmed, retrieved 7 Sept 2026.

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