ArticleInfrequent Milk Progesterone Measurements in Daughters Enable Bull Selection for Cow Fertility*
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Key words
bull selection
cow fertility
milk progesterone
first luteal activity
Abbreviations key
CLA
interval from calving to first luteal activity
CLA50%
lactation stage at which 50% of the daughters of a bull have an active corpus luteum
NR56
nonreturn rate at 56 d after insemination
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This study was financed by Holland Genetics, partly through a grant of the Dutch Ministry of Economic Affairs, Project BTS 98194.
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Current address: Division Animal Resources Development, Animal Sciences Group, Wageningen University and Research Center, 8200 AB Lelystad, The Netherlands.
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Current address: NRS B. V., P.O. Box 454, 6800 AL Arnhem, The Netherlands.
Copyright © 2004 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.