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American Simmental Association Quick Reference to EPDs, Indexes and $Values All-Purpose Index (API): Dollars per cow exposed under an all-purpose-sire scenario. Birth Weight (BW): Pounds of birth weight. Calving Ease (CE): Percent of unassisted births when used on heifers. Carcass Weight (CW): Pounds of carcass weight at 475 days. Docility (DOC): Percent of offspring receiving a disposition score of 1 (docile). Maternal Calving Ease (MCE): Percent of unassisted births in first-calving daughters. Milk (MLK): Pounds of weaning weight due to milk. Marbling (MARB): Carcass marbling score at 475 days. Maternal Weaning Weight (MWW): Pounds of weaning weight due to milk and growth. Ribeye Area (REA): Square inches of carcass ribeye at 475 days. Terminal Index (TI): Dollars per cow exposed under a terminal-sire scenario.
American Angus Association EPD Definitions 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 EPD) , 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 EPD) , 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 EPD) , expressed in pounds, is a predictor of a sire’s ability to transmit yearling growth to his progeny compared to that of other sires. 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. 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. Weaned Calf Value ($W) , an index value expressed in dollars per head, is the expected average difference in future progeny performance for preweaning merit. $W includes both revenue and cost adjustments associated with differences in birth weight, weaning direct growth, maternal milk, and mature cow size. Feedlot Value ($F) , an index value expressed in dollars per head, is the expected average difference in future progeny performance for postweaning merit compared to progeny of other sires. Grid Value ($G) , an index value expressed in dollars per head, is the expected average difference in future progeny performance for carcass grid merit compared to progeny of other sires. Beef Value ($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.
Weaning Weight (WW): Pounds of weaning weight. Yearling Weight (YW): Pounds of yearling weight. Yield Grade (YG): Carcass yield grade score at 475 days.
Horned/Polled Status Homo: Homozygous Hetero: Heterozygous
Homozygous polled means this animal has no horns, an all offspring from the animal will be born without horns. Pp = Heterozygous polled means this animal does not have horns, but offspring may or may not have horns depending on their mate.
Sc=Scurs are incompletely developed horns that aren’t attached to the calf’s skull, but are visible on their skin.
If an animal has two polled genes(PP), homozygous, or one polled and one horned gene (Pp), heterozygous, it will be polled. However, if it is heterozygous polled (Pp) it may pass either the polled or horned gene on to its’ offspring. The only situation when an animal will be horned is when it possesses two recessive horned genes (pp), homozygous horned.
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