Summary and Implications
The use of an initial real-time ultrasound image (RTU) of the 12th rib longissimus dorsi muscle (REA), external backfat (BF) and intramuscular fat (IMF) when coupled with feeding data collected on feedlot cattle can be used to project final REA, BF and IMF. By doing these estimates, subsequent quality and yield grades of the finished animal can be projected.
Iowa State University
Dahlke, Garland R.
"Revalidation of a REA, IMF and BF Projection Model Using
Real-time Ultrasound Imaging and Feeding Data in Cattle,"
Animal Industry Report:
AS 658, ASL R2688.
Available at: http://lib.dr.iastate.edu/ans_air/vol658/iss1/20