AMERICAN SIMMENTAL ASSOCIATION EPD & INDEX DEFINITIONS CE
Reported as the difference in percentage of calves being born unassisted out of first-calf heifers, with higher values representing greater calving ease. Reported as the difference in pounds of calf birth weight. Reported as the difference in pounds of progeny weaning weight. Reported as the difference in pounds of progeny yearling weight. Reported as the difference in post-weaning pounds gained on a daily basis. Reported as the difference in pounds of daily dry matter intake. Reported as the difference in percentage of daughters calving unassisted as first-calf heifers.
BW WW
YW
ADG DMI MCE
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. Reported as the difference in progeny USDA Yield Grade score units (1–5).
YG
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. Reported as the difference in square inches of ribeye area between the 12th and 13th rib. 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).
REA
$API
$TI Evaluates sires for use on mature Angus cows with all offspring put on feed and sold on a grid (grade and yield). $GAIN A prediction designed to identify animals that are more profitable in the feedlot by converting feed into weight. $Gain is a combination of DMI and ADG, where ADG is weighted by the value of a pound of gain, and DMI is negatively weighted by the cost of a pound of dry matter. $Gain is expressed as the dollar difference per head per day during the post-weaning period.
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