A web-based decision support system was used to quantify the extent that economic values of genetic changes in calving ease (CED) and heifer pregnancy (HP) are dependent upon average phenotypic performance for each trait. A 1000 cow Red Angus base herd was generated with merit equivalent to all cows calving in 2005 from the Red Angus Association of America (RAAA) herd book. Sires representing the complete range of HP expected progeny differences (EPD) were generated and mated to each of 9 base cow herds differing for level of phenotypic HP, ranging from 60% to 100%. For calving ease, sires were generated with EPD for CED ranging from -14% to +27% and mated to 11 base herds with phenotypic levels of calving ease ranging from 50 to 99%. Change in net income was calculated for each combination within trait. A unit change in heifer pregnancy EPD for the 1000 cow herd was worth \$210 to \$12 depending upon herd average heifer pregnancy. Heifer pregnancy improvements had little value when heifer pregnancy was high, and increasing value as herd performance. A similar trend existed for CED whose value of a unit change varied from \$390 to \$11.

R. M Enns, Dorian J Garrick, B. W Brigham

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 31.03, 2006
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