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Journal of Animal Science, Vol 68, Issue 11 3502-3506, Copyright © 1990 by American Society of Animal Science

JOURNAL ARTICLE

Using live animal ultrasound measures of ribeye area and fat thickness in yearling Hereford bulls

J. W. Turner, L. S. Pelton and H. R. Cross
Dept. of Anim. Sci., Texas A&M Univ., College Station 77843-2471.

Ultrasonic measurements of fat thickness (FAT) and ribeye area (REA) were analyzed together with weight (WT), scrotal circumference (SC) and age data from 385 yearling Hereford bulls representing 45 sires. Additional variables created were 100*REA/WT (REACWT) and 365-d adjusted REA (AREA). Multiplicative age adjustment for AREA was calculated from linear regression of REA on age. Heritabilities were .45 +/- .17 for REACWT, .36 +/- .16 for WT, .12 +/- .13 for REA, .11 +/- .13 for AREA, .04 +/- .13 for FAT and .18 +/- .14 for SC. Phenotypic and genetic correlations were strongly negative for WT with REACWT. Neither AREA nor REACWT alone were considered suitable muscling variables due to their association with age, WT and FAT. Ultrasound REA measurements should be adjusted for the linear effects of age and WT and quadratic effects of FAT before being used for selection. Measurement of SC indicated a strong association with WT (r = .55) and a moderate positive genetic correlation with REA (.49 +/- .58).


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A. M. Stelzleni, T. L. Perkins, A. H. Brown Jr., F. W. Pohlman, Z. B. Johnson, and B. A. Sandelin
Genetic parameter estimates of yearling live animal ultrasonic measurements in Brangus cattle
J Anim Sci, December 1, 2002; 80(12): 3150 - 3153.
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Copyright © 1990 by the American Society of Animal Science.