Abstract
Index selection is the most effective selection strategy to improve total merit. Index selection requires the economic values (EVs) of the traits in the breeding goal and the genetic parameters of the traits in the breeding goal and in the index (Hazel and Lush, 1942). According to this theory, in most countries a national selection index has been developed for dairy cattle (Miglior et al., 2005). In Iran a national selection index has not yet been developed. The first objective of this study was, therefore, to estimate economic values for production traits (milk, fat and protein yield) and longevity for Holsteins in Iran. The second objective was to compare the proposed Iranian selection index with selection indices of other countries in the world.
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