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Article

Within-herd effects of age at test day and lactation stage on test-day yields.

Journal of dairy science - 1 Nov 2003

Bormann J, Wiggans G R, Druet T, Gengler N

Abstract excerpt

Variance ratios were estimated for random within-herd effects of age at test day and lactation stage, on test-day yield and somatic cell score to determine whether including these effects would improve the accuracy of estimation. Test-day data starting with 1990 calvings for the entire US Jersey population and Holsteins from California, Pennsylvania, Wisconsin, and Texas were analyzed. Test-day yields were...

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Identifiers

PMID: 14672208
DOI: 10.3168/jds.S0022-0302(03)73983-6

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

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