title: Effects of graded levels of potato by-products in barley- and corn-based beef feedlot diets: II. Palatability.
abstract: The objective of this study was to evaluate the effects of barley- or corn-based diets containing 0, 10, or 20% potato by-product (DM basis) on Warner-Bratzler shear force and palatability of beef. One hundred forty-four crossbred beef steers (333+/-.44 kg) were allotted within weight block (3) to a randomized complete block design with a 2 x 3 factorial arrangement of dietary treatments. Main effects were grain (barley or corn) and level of potato by-product (0, 10, or 20% of diet DM). There were a total of 18 pens with eight steers per pen and three pens per treatment. Steers were fed diets containing 83% concentrate (grain plus potato by-product), 10% supplement, and 7% alfalfa (DM basis) for an average of 130 d. Longissimus muscle cuts were used for Warner-Bratzler shear force determination (four steers per pen) and evaluation (two steers per pen) by a 10-member trained laboratory panel, a professional flavor/texture profile panel, and by consumer panels. Diet did not affect (P > .10) Warner-Bratzler shear force or trained laboratory panel tenderness, juiciness, and flavor intensity scores. Flavor/texture profile panel scores indicated feeding a corn-based diet as opposed to barley-based diet produced a more appropriate well-balanced and well-blended beef flavor and texture. However, the magnitudes of the differences were relatively small, and flavor and texture amplitude ratings for both barley- and corn-fed beef were well above average. Beef from steers fed 10 or 20% potato by-product had lower (P < .05) incidences of inappropriate aromatics and aftertastes, which may have a slightly beneficial effect on beef flavor, but flavor amplitude was not affected (P > .05) by level of potato. Moreover, consumer panel overall acceptability scores were not affected by diet. Thus, feedlot diets containing corn or barley with or without potato by-product should result in palatable beef products.
authors.affiliation: Department of Animal Sciences, Washington State University, Pullman 99164-6310, USA. busboom@wsu.edu
authors.forename: J R
authors.initials: JR
authors.lastname: Busboom
authors.forename: M L
authors.initials: ML
authors.lastname: Nelson
authors.forename: L E
authors.initials: LE
authors.lastname: Jeremiah
authors.forename: S K
authors.initials: SK
authors.lastname: Duckett
authors.forename: J D
authors.initials: JD
authors.lastname: Cronrath
authors.forename: L
authors.initials: L
authors.lastname: Falen
authors.forename: P S
authors.initials: PS
authors.lastname: Kuber
mesh_terms: D000821:Animal Feed; D000818:Animals; D002417:Cattle; D001467:Hordeum; D008460:Meat / Q000592:standards*; D011897:Random Allocation; D011198:Solanum tuberosum; D013649:Taste; D003313:Zea mays