Muscle score: its usefulness in describing the potential yield of saleable meat from live steers and their carcasses [beef cattle]
1993
Perry, D. (New South Wales Agriculture, Trangie (Australia). Agricultural Research Centre) | McKiernan, W.A. (New South Wales Agriculture, Scone (Australia)) | Yeates, A.P. (New South Wales Agriculture, Mudgee (Australia))
For 149 domestic trade weight steers examined, assessors did not give steers with a greater subcutaneous fat depth better muscle scores when scoring for muscle and intermuscular fat. There was a negative correlation between live muscle score and P8 fat depth, and no significant correlation between carcass muscle score and P8 fat depth. The associations between muscle score and yield of saleable meat were investigated using multiple regression techniques. For saleable meat yield (kg), liveweight and carcass weight were the main contributors to the variation explained by the models fitted. For saleable meat yield as a percentage of carcass weight, most of the variation accounted for by the models fitted was explained by fat depth, muscle score, and eye muscle area. When added after weight and fat depth in regression models, muscle score significantly increased the coefficient of determination in all cases, with an associated decrease in the residual standard deviation. The effect was strongest for percentage of saleable meat. At the same weight and fat depth, animals or carcasses with better muscle scores produced more saleable meat
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