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Evaluation of sire differences in postweaning growth traits and carcass characteristics, and the use of ultrasound measurements as predictors of observed carcass values in purebreed beefmaster steers
(FW), carcass weight (CW), fat thickness (FT), kidney,
(IW), grass ADG (GADG), feedlot ADG (FADG), final weight
(YG), marbling score (MS), quality grade (QG), and shear
56 purebred Beefinaster steers, representing I I purebred
and 168-d. A fixed effects model was used with sire and kill
Beefinaster sires were used in a cooperative study sponsored
by Beefmaster Breeders United. The steers were grazed on
correlation between ultrasound ribeye area and observed
differences were observed in IW (P < .05) and GADG (P <.001).
group as independent variables to analyze initial weight
kg). The steers met industry-acceptable ranges for CW (3 3 5
mean shear force of 2.74 .︢07 k-a 0. Kill group effect was
pelvic, and heart fat (KPH), ribeye area (REA), yield grade
Postweaning growth, carcass yield, and lean quality traits of
real-time ultrasound measures of fat thickness and live
significant for IW (P <.05), GADG (P <.001), FADG (P < .001),
Sire effects were not found for FADG, FW, CW, FT, KPH, REA,
Texas A&M Agricultural Research Center, McGregor, TX. Using
thickness and observed carcass fat thickness was 0.69. The
values in previously published research for IW (269 ︢4 kg),
was no kill group effect for KPH, REA, YG, MS, or QG. Sire
weight, the steers were sorted into 3 kill groups: 112, 140,
were clearly acceptable in Wamer-Bratzler tenderness, with a
wheat pasture for 69 days, then finished in drylot at the
YG, MS, QG, or SF. The correlation between ultrasound fat
Issued also on microfiche from Lange Micrographics.
Includes bibliographical references: pages 45-48.