Carcass merit traits: development of EPDS for Warner-Bratzler shear force and DNA marker validation
Kansas Agricultural Experiment Station Research Reports Carcass merit traits: development of EPDS for Warner-Bratzler shear force and DNA marker validation
E.J. Pollak 0
E.A. Westcott
0 Pollak , E.J.; Lipsey, R.J.; Westcott, E.A.; Dikeman, Michael E.; and Stroda, Sally L. (2001) "Carcass merit
Recommended Citation traits: development of EPDS for Warner-Bratzler shear force and DNA marker validation," Kansas Agricultural Experiment Station Research Reports: Vol. 0: Iss. 1. https://doi.org/10.4148/2378-5977.1714
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Carcass merit traits: development of EPDS for Warner-Bratzler shear force and
DNA marker validation
Abstract
Warner-Bratzler shear force data on strip loin steaks were obtained on 761 steers from contemporary
groups of progeny from the most popular 38 Simmental sires, and 133 steers from nine Simbrah sires.
The range for Warner-Bratzler shear force EPDs for the Simmental sires was from -0.51 lb (more tender)
to +0.48 lb (less tender). The range in EPDs for the Simbrah sires was from -0.73 to +0.73 lb. In addition,
DNA analyses and screening have been completed for 11 quantitative trait loci on several Simmental and
Simbrah sires. Information from this project should allow cattle producers to improve carcass traits,
tenderness, and other palatability traits through classical genetic selection or through DNA
markerassisted selection.
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Authors
E.J. Pollak, R.J. Lipsey, E.A. Westcott, Michael E. Dikeman, and Sally L. Stroda
This research report is available in Kansas Agricultural Experiment Station Research Reports:
https://newprairiepress.org/kaesrr/vol0/iss1/311
Summary
Warner-Bratzler shear force data on strip
loin steaks were obtained on 761 steers from
contemporary groups of progeny from the
most popular 38 Simmental sires, and 133
steers from nine Simbrah sires. The range
for Warner-Bratzler shear force EPDs for the
Simmental sires was from -0.51 lb (more
tender) to +0.48 lb (less tender). The range in
EPDs for the Simbrah sires was from -0.73
to +0.73 lb. In addition, DNA analyses and
screening have been completed for 11
quantitative trait loci on several Simmental and
Simbrah sires. Information from this project
should allow cattle producers to improve
carcass traits, tenderness, and other
palatability traits through classical genetic selection
or through DNA marker-assisted selection.
Introduction
The Carcass Merit Project is described in
the preceding article. The specific objective
reported here was to measure longissimus
muscle (strip loin steak) Warner-Bratzler
shear force and to calculate EPDs based on
761 progeny from 38 Simmental sires and
133 progeny from nine Simbrah sires.
Experimental Procedures
Strip loin steaks were obtained from 761
progeny of the 38 most widely used
Simmental sires and 133 progeny from nine of the
most widely used Simbrah sires, both mated
to commercial cows. Steaks were retrieved at
the time of carcass data collection. One or
more reference sires was used in each test
herd. BIF guidelines for sire evaluation were
followed. Steaks were vacuum packaged and
aged at 33-37°F until 14 days postmortem.
They were cooked in a Blodgett oven at
325°F to an endpoint temperature of 158°F.
Eight ½-inch cores were removed and
sheared on an Instron Universal Testing
Machine using the Warner-Bratzler shear
device. Researchers at Cornell University
conducted the genetic evaluations and
calculations of EPDs, using a heritability estimate
of 30% for Warner-Bratzler shear force.
Preliminary Results
Table 1 lists Simmental and Simbrah
sires that had seven or more progeny
evaluated, their sire and maternal grandsire, their
EPDs, the EPD accuracy, and the number of
progeny slaughtered. The most tender
Simmental sire had an EPD for Warner-Bratzler
shear force of -0.51 lb and the least tender
sire had an EPD of +0.48 lb. The most tender
Simbrah sire had an EPD of -0.73 lb and the
least tender, +0.73 lb. The accuracies are
relatively low for some of the sires because
of small progeny numbers. The differences
in the accuracy values are somewhat
analog (...truncated)