J. Anim Sci.
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Journal of Animal Science, Vol 75, Issue 9 2300-2307, Copyright © 1997 by American Society of Animal Science

JOURNAL ARTICLE

Use of real-time ultrasound to evaluate live animal carcass traits in young performance-tested beef bulls

R. D. Bergen, J. J. McKinnon, D. A. Christensen, N. Kohle and A. Belanger
Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, Canada.

Young bulls were ultrasonically scanned to 1) study breed differences for 12th rib fat depth (USFAT) and longissimus muscle area (USREA), 2) evaluate the nature and predictability of USFAT and USREA development, and 3) determine the effect of age (YFAT and YREA, respectively) or weight (WREA) adjustments on USFAT and USREA. Angus (AA), Charolais (CH), Hereford (HH), Shorthorn (SS), and Simmental (SM) bulls (n = 886) were studied in 2 yr at two stations. Breed differences were observed for end of test USFAT (AA = SS > HH > CH = SM, P < .05) and USREA (CH = SM > SS = AA > HH, P < .05). Within-breed coefficients of variation were 29.8 to 48.4% for end of test USFAT and from 9.0 to 10.8% for end of test USREA. In most bulls, USFAT development was neither linear nor quadratic (P > .05), but USREA development was linear (P < .05). Prediction equations were characterized by low r2 and high residual standard deviation (RSD) values, although those for d-84 USREA had r2 values from .63 to .70 and RSD values from 4.09 to 5.80 cm2. High associations were obtained between end of test USFAT with YFAT (r = .83 to .91, P < .05) and USREA with YREA (r = .74 to .84, P < .05) but not for end of test USREA with WREA (r = .31 to .56, P < .05). These results indicate that end of test ultrasound measurements may be a useful addition to performance testing programs.


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D. H. Crews Jr., N. H. Shannon, R. E. Crews, and R. A. Kemp
Weaning, yearling, and preharvest ultrasound measures of fat andmuscle area in steers, bulls, and heifers
J Anim Sci, November 1, 2002; 80(11): 2817 - 2824.
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Copyright © 1997 by the American Society of Animal Science.