請見Livestock Production Science 1995. 44: 53-59.
BF(ultrasonic backfat thickness): Backfat thickness was
measured on both sides of the following position:
behind the scapula (肩胛後方), last rib (最後肋骨),
and lumbar vertebra (最後腰椎). BF was corrected
for weight as follows (Chyr, 1980) :
BF = average backfat thickness 三點背脂厚度平均 (mm) X [ 1 + 0.0088184 X ( 110-end-test body weight (kg)) ]