Page 10 - Heart River Ranch/Open A Angus Bull Production Sale – March 8, 2023

Reference Sires
8 – Quality Genetics Built on a Heritage of Commitment

RED ANGUS GUIDE TO EPDS YW ........Yearling Weight predicts differences in 365-day yearling weight.
(Pounds/High Value)
RedAngus.org ADG .......Average Daily Gain predicts differences in weight gain between 205 and
365 days of age. (Pounds/High Value)
ProS .....Profi tability and Sustainability is an all-purpose index that predicts average DMI .......Dry Matter Intake predicts differences in daily feed intake as measured in
economic differences in all segments in the beef supply chain. This index is a a feedlot during the post-weaning period. (Pounds/Low Value)
combination of the breeding objectives modeled in the HerdBuilder and GridMaster
selection indexes. In this index, replacement heifers are retained from within the MILK .....Milk predicts differences in weaning weight attributed to the milking
herd and all remaining progeny are fed out to slaughter and sold on a quality-based ability of the animal’s daughters. (Pounds/High Value)
grid. Traits included in this index include calving ease, growth, HPG, STAY, Mature
Weight, Dry Matter Intake and carcass traits. The resulting index is expressed in ME ........Maintenance Energy predicts the difference in maintence energy
dollars per head born (Index/High Value). requirements. (Mcal per Month/Low Value)
HB .......HerdBuilder is a maternal selection index that predicts the economic HPG .......Heifer Pregnancy predicts differences in the percent of daughters who
differences of animals for traits that are important from conception through are able to conceive and calve at 2 years of age following exposure to breeding.
weaning. Expressed as dollars per head born, HB is calculated based on the scenario (Percent/High Value)
that bulls are mated to heifers and cows, replacement heifers are retained and all CEM ......Calving Ease Maternal predicts differences in the percent of daughters
remaining progeny are marketed at weaning. Traits included in the HB index include who are able to calve unassisted as 2-year-old heifers. (Percent/High Value)
Calving Ease Direct, Calving Ease Maternal, Weaning Weight, Milk, Mature Weight,
Heifer Pregnancy and Stayability (Index/High Value). STAY......Stayability predicts differences in the ability of an animals’ retained
GM.......GridMaster is a selection index that predicts the average economic daughters to remain productive in the herd – calve every year – through 6 years of
difference of non-replacement calves through the post-weaning phase of production. age. (Percent/High Value)
GM places selection pressure on growth, feedyard performance and carcass traits. MARB ....Marbling predicts differences in marbling score – amount of
Expressed as dollars per head born, GM is calculated based on the scenario that intramuscular fat measured at the 13th rib. (Marbling Score Units/High Value)
progeny are fed out to slaughter and marketed on a quality-based carcass grid.
Traits included in GM include Average Daily Gain, Carcass Weight, Dry Matter Intake, YG .........Yield Grade predicts differences in USDA Yield Grade, which is calculated
Marbling, Back Fat and Rib Eye Area (Index/High Value). using CW, REA and Fat. (Yield Grade Units/Low Value)
CED ........Calving Ease Direct predicts differences in the percent of calves born CW ........Carcass Weight predicts differences in actual hot carcass weight.
unassisted out of 2-year-old dams. (Percent/High Value) (Pounds/High Value)
BW ........Birth Weight predicts differences in actual birth weight of progeny. REA .......Ribeye Area predicts differences in square inches of ribeye area
(Pounds/Low Value) measured at the 13th rib.(Square Inches/High Value)
WW .......Weaning Weight predicts differences in 205-day weaning weight. FAT ........Fat predicts differences in the depth of backfat measured between the
(Pounds/High Value) 12th and 13th ribs. (Inches/Low Value)

AMERICAN ANGUS ASSOCIATION SELECTION TOOLS Maternal Milk (Milk), is a predictor of a sire’s genetic merit for milk and mothering $VALUE INDEXES
ability in his daughters compared to daughters of other sires. In other words, it is $Value Indexes, reported in dollars per head, are multi-trait economic selection
Expected Progeny Difference (EPD), is the prediction of how future progeny of that part of a calf’s weaning weight attributed to milk and mothering ability. indexes where a higher values suggest more profit when comparing two individuals.
each animal are expected to perform relative to the progeny of other animals listed Mature Weight (MW), expressed in pounds, is a predictor of the difference in Maternal Weaned Calf Value ($M), expressed in dollars per head, predicts prof-
in the database. EPDs are expressed in units of measure for the trait, plus or minus. mature weight of daughters of a sire compared to the daughters of other sires. itability differences in progeny from conception to weaning by decreasing mature
Accuracy (ACC), is the reliability that can be placed on the EPD. An accuracy of Mature Height (MH), expressed in inches, is a predictor of the difference in mature cow size and improving docility, foot structure and fertility while maintaining
close to 1.0 indicates higher reliability. Accuracy is impacted whether the animal height of a sire’s daughters compared to daughters of other sires. weaning weights consistent with current production.
has a genotype and the number of progeny and ancestral records included in the Weaned Calf Value ($W), expressed in dollars per head, provides the expected
analysis. MANAGEMENT difference in future progeny preweaning performance from birth to weaning.
Calving Ease Direct (CED), is expressed as a difference in percentage of unassisted Docility (DOC), is expressed as a difference in yearling cattle temperament, with Cow Energy Value ($EN), is expressed in dollar savings per cow each year due to
births, with a higher value indicating greater calving ease in first-calf heifers. It a higher value indicating more favorable docility in a sire’s offspring compared to lower cow maintenance energy requirements (due to lactation and body size) with a
predicts the average difference in ease with which a sire’s calves will be born when another sire. larger number being more favorable.
he is bred to first-calf heifers. Claw Set (Claw), is expressed in units of claw-set score, a lower EPD is more Feedlot Value ($F), expressed in dollars per head, is the expected average
Birth Weight (BW), expressed in pounds, is a predictor of a sire’s ability to transmit favorable, indicating a sire will produce progeny with more symmetrical, even and difference in future progeny performance for postweaning feedlot merit (growth
birth weight to his progeny compared to that of other sires. appropriately spaced toes. and feed efficiency) compared to progeny of other sires assuming producers retain
Weaning Weight (WW), expressed in pounds, is a predictor of a sire’s ability to Foot Angle (Angle), is expressed in units of foot-angle score, a lower EPD is more ownership of cattle and sell on a carcass weight basis.
transmit weaning growth to his progeny compared to that of other sires. favorable, indicating a sire will produce progeny with an angle closer to 45 degrees Grid Value ($G), expressed in dollars per carcass, is the expected average
Residual Average Daily Gain (RADG), feed efficiency expressed in pounds per at the pastern and appropriate toe length and heel depth. difference in future progeny performance for carcass grid merit, including quality
day, is a predictor of a sire’s genetic ability for postweaning gain in future progeny Pulmonary arterial pressure EPD (PAP), is expressed in millimeters of Mercury and yield grade attributes, compared to progeny of other sires.
compared to that of other sires, given a constant amount of feed consumed. (mmHg), with a lower EPD being more favorable indicating a sire should produce Beef Value ($B), expressed in dollars per carcass, represents the expected average
Yearling Weight (YW), expressed in pounds, is a predictor of a sire’s ability to progeny with a lower PAP score to decrease the risk of progeny contracting high differences in the progeny postweaning performance and carcass value compared
transmit yearling growth to his progeny compared to that of other sires. altitude disease most commonly experienced at 5,500 ft or greater in elevation. to progeny of other sires. This index assumes commercial pro ducers wean all male
Yearling Height (YH), is a predictor of a sire’s ability to transmit yearling height, and female progeny, retain ownership of these animals through the feedlot and sell
expressed in inches, compared to the that of other sires. CARCASS on a carcass merit grid.
Scrotal Circumference (SC), expressed in centimeters, is a predictor of the Carcass Weight (CW), expressed in pounds, is a predictor of the differences in hot Combined Value ($C), an index, expressed in dollars per head, includes all traits
difference in transmitting ability for scrotal size compared to that of other sires. carcass weight of a sire’s progeny compared to progeny of other sires. that make up both $M and $B with the objective that commercial producers will
Marbling (Marb), is expressed as a fraction of the difference in USDA marbling replace 20% of their breeding females per year with replacement heifers retained
MATERNAL score of a sire’s progeny compared to progeny of other sires. within their own herd. The remaining cull heifer and steer progeny are then assumed
Heifer Pregnancy (HP), is a selection tool to increase the probability or chance of Ribeye Area (RE), expressed in square inches, is a predictor of the difference in to be sent to the feedlot where the producers retain ownership of those cattle and
a sire’s daughters becoming pregnant as first–calf heifers during a normal breeding ribeye area of a sire’s progeny compared to progeny of other sires. sell them on a quality-based carcass merit grid.
season. A higher EPD is more favorable. Fat Thickness (Fat), expressed in inches, is a predictor of the differences in
Calving Ease Maternal (CEM), is expressed as a difference in percentage of external fat thickness at the 12th rib (as measured between the 12th and 13th ribs) of
unassisted births, with a higher value indicating greater calving ease in first-calf a sire’s progeny compared to progeny of other sires.
daughters. It predicts the average ease with which a sire’s daughters will calve as
first-calf heifers when compared to daughters of other sires.