Summary and Implications
Records (n = 11,305) from the 1998 to 2003 National Swine Improvement Federation (NSIF) ultrasound certification programs were used to determine the effect of technician, machine (A-mode and B-mode: Aloka 500, Classic Scanner 200), and level of animal fat depth and loin muscle area on the accuracy of tenth rib off-midline backfat (BF10) and loin muscle area (LMA) measured on live pigs.
Iowa State University
Burkett, J. L.; Newcom, D. W.; Baas, Thomas J.; Schwab, Clint R.; and Stalder, Kenneth J.
"Effect of Technician, Machine, and Animal Body Composition on Accuracy of Ultrasonic Measures of Backfat and Loin Muscle Area in Swine,"
Animal Industry Report:
AS 650, ASL R1941.
Available at: http://lib.dr.iastate.edu/ans_air/vol650/iss1/100