Angus steers (n = 78) were feedlot-finished to approximately 703 kg live
weight. The fnished steers were slaughtered at a commercial packing
plant, chilled, and evaluated for USDA and Japanese yield and qualitygrade
characteristics. The resulting carcasses were excessively heavy and
fat for the domestic (US) beef industry. Over 70% of the carcasses were
US Yield Grade 5, and almost 40% were Japanese Yield Score 'C'. Although
excessively fat externally, fewer than 50% of the carcasses qualified
for US Prime, and none of the carcasses qualified for Japanese Meat
Quality Score 5. Moderate to high correlations were observed between US
twelfth-rib carcass traits and Japanese sixth-rib traits; however, multipleregression
equations based on USDA carcass characteristics explained
only 46 and 25% of the observed variation in Japanese marbling score and
estimated percentage wholesale-cut yield, respectively.
INTRODUCTION