EPD & Index Definitions
The following are definitions of American Simmental Association’s EPD and indexes as reported in this catalog:
CE: Reported as the difference in percentage of calves being born unassisted out of first-calf heifers, with higher values representing greater calving ease. BW : Reported as the difference in pounds of calf birth weight. WW : Reported as the difference in pounds of progeny weaning weight. YW : Reported as the difference in pounds of progeny yearling weight. ADG : Reported as the difference in post-weaning pounds gained on a daily basis. DMI : Reported as the difference in pounds of daily dry matter intake. MCE : Reported as the difference in percentage of daughters calving unassisted as first-calf heifers. MILK : Reported as the difference in maternal pounds of weaning weight from an individual’s daughters due to milk. MWW : Reported as the pounds of weaning weight expressed in daughters’ progeny due to the milk production of the daughter and the direct genetic effect for weaning growth. STAY : Reported as the difference in probability of a sire’s daughters staying in the herd until 6 years of age, given that they calved as a 2-year-old. DOC : Reported as the difference in yearling-age progeny temperament, represented as a difference in probability that progeny will be scored as a 1, rather than a 2–6 on the docility scale (1 = docile disposition; 6 = extremely aggressive). CW : Reported as the difference in pounds of progeny carcass weight. YG : Reported as the difference in progeny USDA Yield Grade score units (1–5). MARB : Reported as the difference in progeny carcass marbling score. BF : Reported as the difference in inches of external backfat at the 12th and 13th rib. REA : Reported as the difference in square inches of ribeye area between the 12th and 13th rib. API : Evaluates sires for use on the entire cow herd (bred to both Angus first-calf heifers and mature cows) with the portion of their daughters required to maintain herd size retained and the remaining heifers and steers put on feed and sold on a grid (carcass grade and yield).
TI :
Evaluates sires for use on mature Angus cows with all offspring put on feed and sold on a grid (grade and yield).
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February 5, 2025
1:00 PM, Mtn.
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