J. Anim Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Herring, W. O.
Right arrow Articles by Benyshek, L. L.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Herring, W. O.
Right arrow Articles by Benyshek, L. L.

Journal of Animal Science, Vol 72, Issue 9 2216-2226, Copyright © 1994 by American Society of Animal Science

JOURNAL ARTICLE

Evaluation of machine, technician, and interpreter effects on ultrasonic measures of backfat and longissimus muscle area in beef cattle

W. O. Herring, D. C. Miller, J. K. Bertrand and L. L. Benyshek
Animal and Dairy Sciences Department, Univ. of Georgia, Athens 30602-2771.

Before slaughter, 44 Hereford-sired steers were measured ultrasonically for backfat (UFAT) and longissimus muscle area (ULMA) between the 12th and 13th ribs by three technicians (TECH) using two different machines (MACH) on two consecutive days (DAY). Each TECH interpreted (INT) his own images in addition to other TECH images. The absolute values of the difference between the 2 DAY's ultrasound measurements for ULMA (magnitude of LMAR) and UFAT (magnitude of FATR) were analyzed with a model including fixed effects of MACH and TECH with a random effect of steer and all interactions. For both magnitude of LMAR and magnitude of FATR, MACH x TECH was significant (P < .10). Correlations between the 2 DAY's measurements ranged from .36 to .90 and .69 to .90 for ULMA and UFAT, respectively. Simple statistics to quickly evaluate TECH and MACH were developed. Root mean squared errors (RMSE) and error standard deviations (ESD) between repeated measurements ranged from 3.89 to 11.32 and 3.93 to 11.34 cm2 for ULMA and .12 to .20 cm and .12 to .20 cm for UFAT, respectively. For accuracy, the absolute values of the difference between the ultrasound and carcass measurement for fat (magnitude of FATD) and longissimus muscle area (magnitude of LMAD) were analyzed with a model accounting for fixed effects of DAY, TECH, and MACH and a random effect of steer with all higher-order interactions. For magnitude of LMAD, TECH x MACH was a significant source of variation (P < .001). Also, a similar model was fit that included the fixed effects of TECH, MACH, and INT and a random effect of steer with all interactions. The MACH x INT interaction was found to be significant for magnitude of LMAD (P < .05). From this research, TECH and MACH differences do exist. Ultrasound is a valid means of measuring carcass traits in live steers if appropriate personnel and equipment are selected.


This article has been cited by other articles:


Home page
 J. Exp. Biol.Home page
C. A. Gilman and B. O. Wolf
Use of portable ultrasonography as a nondestructive method for estimating reproductive effort in lizards
J. Exp. Biol., June 1, 2007; 210(11): 1859 - 1867.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
S. R. Silva, J. J. Afonso, V. A. Santos, A. Monteiro, C. M. Guedes, J. M. T. Azevedo, and A. Dias-da-Silva
In vivo estimation of sheep carcass composition using real-time ultrasound with two probes of 5 and 7.5 MHz and image analysis
J Anim Sci, December 1, 2006; 84(12): 3433 - 3439.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
P. B. Wall, G. H. Rouse, D. E. Wilson, R. G. Tait Jr., and W. D. Busby
Use of ultrasound to predict body composition changes in steers at 100 and 65 days before slaughter
J Anim Sci, June 1, 2004; 82(6): 1621 - 1629.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
S. P. Greiner, G. H. Rouse, D. E. Wilson, L. V. Cundiff, and T. L. Wheeler
The relationship between ultrasound measurements and carcass fat thickness and longissimus muscle area in beef cattle
J Anim Sci, March 1, 2003; 81(3): 676 - 682.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
S. P. Greiner, G. H. Rouse, D. E. Wilson, L. V. Cundiff, and T. L. Wheeler
Accuracy of predicting weight and percentage of beef carcass retail product using ultrasound and live animal measures
J Anim Sci, February 1, 2003; 81(2): 466 - 473.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
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.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
R. L. Sapp, J. K. Bertrand, T. D. Pringle, and D. E. Wilson
Effects of selection for ultrasound intramuscular fat percentage in Angus bulls on carcass traits of progeny
J Anim Sci, August 1, 2002; 80(8): 2017 - 2022.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1994 by the American Society of Animal Science.