Feeder cattle frame size, muscle thickness and subsequent beef carcass characteristics☆

摘要: Sixty feeder steers were assigned scores for frame size (small, medium or large) and muscle thickness (No. 1, No. 2 3), fed 112 days slaughtered. Grade data collected all 60 carcasses; 12 sides (four from each group) fabricated into boneless, closely trimmed retail cuts the rounds of these also physically separated muscle, fat bone. Marbling score USDA quality grade varied inversely (P < 0·05) with size. Carcass grades were: 33·3% Choice; 67·7% Good 0·0% Standard small-framed cattle; 30·3% Choice, 42·4% 27·3% medium-framed cattle 5·5% 66·7% 27·8% large-framed cattle. Analysis variance showed significant differences among groups in longissimus area carcass weight but no difference yield between 1 3 groups; larger mean carcasses group was offset by their heavier greater over muscle. However, when analysis covariance used to hold fatness constant, 0·05). Also, as feeders, had highest bone ratio round (4·1 1) while 3, lowest (3·4 1).