title: Effects of cooking and shearing methodology on variation in Warner-Bratzler shear force values in beef.
abstract: Longissimus lumborum between the 13th rib and the 4th lumbar vertebra from 57 steers was obtained at 48 h postmortem, stored at 2 degrees C, and frozen after 7 d postmortem. Consecutive 2.54-cm-thick, paired steaks were used to make the following comparisons: Protocol A) steaks were broiled to 70 degrees C, chilled 24 h at 3 degrees C, cored parallel to fiber orientation, and sheared with a Warner-Bratzler attachment to the Instron and Protocol B) steaks were modified-oven-broiled to 65 degrees C, cooled 30 min at 23 degrees C, cored perpendicular to the steak surface, and sheared with a Warner-Bratzler shear machine. Each of the four differences in protocol was subsequently compared one at a time with paired steaks. Protocol A resulted in higher (P < .05) shear force values than Protocol B (6.29 vs 3.60 kg). Neither shearing instrument nor cooling condition contributed to the difference (P > .05) in shear values. However, parallel vs perpendicular core orientation (6.31 vs 4.51 kg, respectively) and broil to 70 degrees C vs modified-oven broil to 65 degrees C cooking method (6.37 vs 5.31 kg, respectively) increased (P < .05) shear force values. Total variance (6.2 vs 1.2 kg2) and the proportion of variance in shear value attributed among animals was greater (P < .05) for Protocol A than for Protocol B (70.0 vs 44.5%). These data indicate that Protocol A resulted in greater animal differences in shear values, and thus was more discriminating than Protocol B.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Roman L. Hruska U.S. Meat Animal Research Center, USDA, Clay Center, NE 68933.
authors.forename: T L
authors.initials: TL
authors.lastname: Wheeler
authors.forename: M
authors.initials: M
authors.lastname: Koohmaraie
authors.forename: L V
authors.initials: LV
authors.lastname: Cundiff
authors.forename: M E
authors.initials: ME
authors.lastname: Dikeman
mesh_terms: D000818:Animals; D002417:Cattle / Q000033:anatomy & histology*; D003296:Cooking; D008297:Male; D008460:Meat / Q000592:standards*; D018482:Muscle, Skeletal / Q000033:anatomy & histology*