ArticleAssociation Between Somatic Cell Count in Early Lactation and Culling of Dairy Heifers Using Cox Frailty Models
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Key words
Cox frailty model
culling
dairy heifer
early lactation somatic cell count
Abbreviations key
HR
hazard ratioLn
SCC
natural log-transformed SCC
LnSCCel
natural log-transformed SCCel
MY
milk yield at test-day (kg, measured after 14 DIM)
SCCel
SCC in early lactation (measured between 5 and 14 DIM)
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Copyright © 2005 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.