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1 Agriculture and Agri-Food Canada – Dairy and Swine Research and Development Centre Lennoxville, QC, Canada
2 Canadian Dairy Network, Guelph, ON, Canada
Corresponding author: Filippo Miglior; e-mail: miglior{at}cdn.ca.
Fifteen countries, based on geographical representation, Interbull membership, and size of progeny testing programs, provided a brief description of national selection index and top bull listings from August 2003. Individual traits included in each selection index were grouped into 3 components as they related to production, durability, and health and reproduction. The relative emphasis for each component within the selection index, as well as the number of common bulls among top listings were compared across countries. Average relative emphasis for production, durability, and health and reproduction, across all countries, was 59.5, 28, and 12.5%, respectively. The main difference between selection indices in various countries was the relative emphasis on production. Overall, the Danish S-Index had the most balanced emphasis across the 3 components, with 34% on production, 29% on durability, and 37% on health and reproduction. Broadening of breeding goals through recent changes to selection indices decreased the similarities of top bull listings across the various countries, with a slightly greater commonality among sires of top bulls.
Key Words: selection index • bull ranking • international dairy
Abbreviation key: Interbull = International Bull Evaluation Service
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