| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Journal of Animal Science, Vol 70, Issue 6 1667-1676, Copyright © 1992 by American Society of Animal Science
JOURNAL ARTICLE |
D. L. Robinson, C. A. McDonald, K. Hammond and J. W. Turner
Animal Breeding and Genetics Unit, University of New England, Armidale, NSW, Australia.
The establishment and evaluation of an assessment system to accredit sonographers for measuring the carcass traits of subcutaneous fat depths and longissimus muscle area (LMA) on potential breeding animals by real-time ultrasound is described. Repeatability of operators, variation between the animal's left and right sides, and variations in technique were assessed from measurements and repeat measurements of 30 cattle by up to eight operators at three testing sessions. Accuracy of carcass data was determined by repeatability of measurements, variability between measurers, between left and right sides of the carcass, and variation due to handling and dressing procedures. Correlations with carcass data averaged .92 for rump fat, .90 for rib fat, and .87 for LMA. Residual SD averaged .81 mm, .88 mm, and 5.1 cm2. A very experienced sonographer can measure LMA only marginally less accurately than it can be measured on the carcass. In Session 3, the SE between repeat fat measurements for accredited sonographers averaged .43 mm, indicating that fat depths can be measured more accurately, but when comparing measurements from different operators, adjustments may be required for differences in technique, otherwise overall accuracy will be about the same, approximately 1 mm. Scanned rump fat measurements were consistently approximately 20% higher than on the chilled, hanging carcass 24 h after slaughter; after applying the standard correction factor of 1.17, LMA measurements were similar. Scan and carcass rib fat measurements were similar for animals with less than or equal to 10 mm of fat cover, above which carcass measurements tended to be higher.
This article has been cited by other articles:
|
|
 |
|
  T. D. Leeds, M. R. Mousel, D. R. Notter, H. N. Zerby, C. A. Moffet, and G. S. Lewis B-mode, real-time ultrasound for estimating carcass measures in live sheep: Accuracy of ultrasound measures and their relationships with carcass yield and value J Anim Sci, November 1, 2008; 86(11): 3203 - 3214. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 U. J. Schroder and R. Staufenbiel Invited Review: Methods to Determine Body Fat Reserves in the Dairy Cow with Special Regard to Ultrasonographic Measurement of Backfat Thickness J Dairy Sci, January 1, 2006; 89(1): 1 - 14. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. P. Greiner, G. H. Rouse, D. E. Wilson, L. V. Cundiff, and T. L. Wheeler Prediction of retail product weight and percentage using ultrasound and carcass measurements in beef cattle J Anim Sci, July 1, 2003; 81(7): 1736 - 1742. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
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]
|
|
|
|
|
|
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 | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
