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Relationships of consumer sensory ratings, marbling score, and shear force value to consumer acceptance of beef strip loin steaks

W. J. Platter^*, J. D. Tatum^*,1, K. E. Belk^*, P. L. Chapman, J. A. Scanga^* and G. C. Smith^*

^* Department of Animal Sciences and and Department of Statistics, Colorado State University, Fort Collins 80523

¹ Correspondence—phone: 970-491-6530; fax: 970-491-0278; E-mail: dtatum{at}lamar.colostate.edu.

Logistic regression was used to quantify and characterize the effects of changes in marbling score, Warner-Bratzler shear force (WBSF), and consumer panel sensory ratings for tenderness, juiciness, or flavor on the probability of overall consumer acceptance of strip loin steaks from beef carcasses (n = 550). Consumers (n = 489) evaluated steaks for tenderness, juiciness, and flavor using nine-point hedonic scales (1 = like extremely and 9 = dislike extremely) and for overall steak acceptance (satisfied or not satisfied). Predicted acceptance of steaks by consumers was high (>85%) when the mean consumer sensory rating for tenderness, juiciness, or flavor for a steak was 3 or lower on the hedonic scale. Conversely, predicted consumer acceptance of steaks was low (10%) when the mean consumer rating for tenderness, juiciness, or flavor for a steak was 5 or higher on the hedonic scale. As mean consumer sensory ratings for tenderness, juiciness, or flavor decreased from 3 to 5, the probability of acceptance of steaks by consumers diminished rapidly in a linear fashion. These results suggest that small changes in consumer sensory ratings for these sensory traits have dramatic effects on the probability of acceptance of steaks by consumers. Marbling score displayed a weak (adjusted R² = 0.053), yet significant (P < 0.01), relationship to acceptance of steaks by consumers, and the shape of the predicted probability curve for steak acceptance was approximately linear over the entire range of marbling scores (Traces⁶⁷ to Slightly Abundant⁹⁷), suggesting that the likelihood of consumer acceptance of steaks increases approximately 10% for each full marbling score increase between Slight to Slightly Abundant. The predicted probability curve for consumer acceptance of steaks was sigmoidal for the WBSF model, with a steep decline in predicted probability of acceptance as WBSF values increased from 3.0 to 5.5 kg. Changes in WBSF within the high (>5.5 kg) or low (<3.0 kg) portions of the range of WBSF values had little effect on the probability of consumer acceptance of steaks.

Key Words: Beef • Consumer Satisfaction • Marketing • Palatability • Prediction • Tenderness

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