American Angus Association ® Selection Tools
Expected Progeny Difference (EPD) , is the prediction of how future progeny of each animal are expected to perform relative to the progeny of other animals listed in the database. EPDs are expressed in units of measure for the trait, plus or minus. Interim EPDs may appear on young animals when their performance has yet to be incorporated into the American Angus Association National Cattle Evaluation (NCE) procedures. This EPD will be preceded by an “I”, and may or may not include the animal’s own performance record for a particular trait, depending on its availability, appropriate contemporary grouping, or data edits needed for NCE. Accuracy (ACC) , is the reliability that can be placed on the EPD. An accuracy of close to 1.0 indicates higher reliability. Accuracy is impacted by the number of progeny and ancestral records included in the analysis.
CARCASS The genetic evaluation produces a single set of EPDs for carcass weight, marbling score, Ribeye area and fat thickness. The units of measure are in carcass trait format and analyzed on an age- constant basis. Carcass Weight EPD (CW) , expressed in pounds is a predictor of the differences in hot carcass weight of a sire’s progeny compared to progeny of other sires. Marbling EPD (Marb) , expressed as a fraction of the difference in USDA marbling score of a sire’s progeny compared to progeny of other sires. Ribeye Area EPD (RE) , expressed in square inches, is a predictor of the difference in ribeye area of a sire’s progeny compared to progeny of other sires. Fat Thickness EPD (Fat) , expressed in inches, is a predictor of the differences in external fat thickness at the 12th rib (as measured between the 12th and 13th ribs) of a sire’s progeny compared to progeny of other sires.
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GROWTH Calving Ease Direct (CED) , is expressed as a difference in percentage of unassisted births, with a higher value indicating greater calving ease in first- calf heifers. It predicts the average difference in ease with which a sire’s calves will be born when he is bred to first-calf heifers. Birth Weight EPD (BW) , expressed in pounds, is a predictor of a sire’s ability to transmit birth weight to his progeny compared to that of other sires. Weaning Weight EPD (WW) , expressed in pounds, is a predictor of a sire’s ability to transmit weaning growth to his progeny compared to that of other sires. Yearling Weight EPD (YW), expressed in pounds, is a predictor of a sire’s ability to transmit yearling growth to his progeny compared to that of other sires. Scrotal Circumference EPD (SC) , expressed in centimeters, is a predictor of the difference in transmitting ability for scrotal size compared to that of other sires. Docility (DOC) , is expressed as a difference in yearling cattle temperament, with a higher value indicating more favorable docility. It predicts the average difference of progeny from a sire in comparison with another sire’s calves.
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#+*KM Broken Bow 002 +*Sitz Florabelle Fanny 4735
*S Architect 9501
S Blossom 7514
#*S Whitlock 179 S Blossom 5525
19437622
ACT BW/RATIO 84 100 ADJ WW 778
#+*Baldridge Compass C041
#*EF Commando 1366 *Baldridge Isabel Y69 #+*PA Power Tool 9108 HARB Wendy 987 JH
#*D A R Wendy T913
HARB Wendy C65 JH
20278092
CED MILK +4 70% +1.2 50% +77 30% +130 35% +1.77 10% +29 10% +16.7 2% +37 3% CW MARB RE FAT $M $W $F $B $C +65 30% +.60 65% +.76 45% +.075 95% +118 1% +98 3% +108 25% +155 50% +319 15% BEPD WEPD YEPD SC DOC HP
MATERNAL Maternal Milk EPD (Milk) , is a predictor of a sire’s genetic merit for milk and mothering ability as expressed in his daughters compared to daughters of other sires. In other words, it is that part of a calf’s weaning weight attributed to milk and mothering ability. Cow Energy Value ($EN) , expressed in dollars savings per cow per year, assesses differences in cow energy requirements as an expected dollar savings difference in daughters of sires. A larger value is more favorable when comparing two animals (more dollars saved on feed energy expenses). Components for computing the cow $EN savings difference include lactation energy requirements and energy costs associated with differences in mature cow size.
$VALUE INDEXES $Value indexes , are multi-trait selection indexes to assist beef producers by adding simplicity to genetic selection decisions. $Values are reported in dollars per head, where a higher value is more favorable. The $Value is an estimate of how future progeny of each sire are expected to perform, on average, compared to progeny of other sires in the database if the sires were randomly mated to cows and if calves were exposed to the same environment. Maternal Weaned Calf Value ($M), an index, expressed in dollars per head, predicts profitability differences from conception to weaning with the underlying breeding objective assuming that individuals retain their own replacement females within herd and sell the rest of the cull female and all male progeny as feeder calves. The model assumes commercial producers will replace 25% of their breeding females in the first generation and 20% of their breeding females in each subsequent generation. Traits included are as follows: calving ease direct, calving ease maternal, weaning weight, milk, heifer pregnancy, docility, mature cow weight, claw set and foot angle. Weaned Calf Value ($W) , an index value expressed in dollars per head, is the expected average difference in future progeny performance for pre- weaning merit. $W includes both revenue and cost adjustments associated with differences in birth weight, weaning direct growth, maternal milk, and mature cow size. Beef Value ($B) , an index value expressed in dollars per head, is the expected average difference in future progeny performance for postweaning and carcass value compared to progeny of other sires.
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