Page 27 - DVAuction Online Catalogs
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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)
, 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.
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.
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.
$VALUE INDEXES
$Value indexes are multi-trait selection indexes, expressed in
dollars per head, to assist beef producers by adding simplicity to
genetic selection decisions. The $Value is an estimate of how future
progeny of each sire are expected to perform, on average, compared to
progeny of other sires in the database if the sires were randomly mated
to cows and if calves were exposed to the same environment.
Weaned Calf Value ($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 ($G),
an index value expressed in dollars per head, is
the expected average difference in future progeny performance for
carcass grid merit compared to progeny of other sires.
•Quality Grade ($QG)
$QG represents the quality grade segment
of the economic advantage found in $G. $QG is intended for the
specialized user wanting to place more emphasis on improving
quality grade. The carcass marbling (Marb) EPD contributes to
$QG.
•Yield Grade ($YG)
$YG represents the yield grade segment of
the economic advantage found in $G. $YG is intended for the
specialized user wanting to place more emphasis on red meat
yield. It provides a multi-trait approach to encompass ribeye, fat
thickness and weight into an economic value for red meat yield.
Beef Value ($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.
CATALOG PRODUCED BY:
RAVELLETTE PUBLICATIONS, INC.
(605) 859-2516 • Philip, SD
Beau Ravellette: 605-685-8155
E-mail:
Website:
