摘要：With the wide-spread use of Expected Progeny Differences (EPDs), theidentification of candidates to become parents has centered primarily on growth as shownby published genetic trends (AAA, 1998). Single trait selection for growth traits couldlead to undesirable correlated responses in mature cow size (Bullock et al., 1993; Meyer,1993) and thus, reproductive inefficiencies (Buttram and Willham, 1989; Fiss and Wilton,1992). Although Hazel (1943) outlines an approach to base selection on profit, producershave not had tools readily available that quantify the economic importance of various traitsor rank bulls based upon the expected differences in progeny profitability. Therefore, theobjective of the Circle A Sire Alliance was to determine genetic differences in profitabilityof progeny from Angus sires in such a manner that those differences could be repeated insubsequent matings under a similar production scenario.
