title: Feedlot performance, carcass traits, and palatability traits of Hereford and Hereford x Brahman steers.
abstract: Short-yearling steer of known genotypes-straightbred Hereford (100H, n = 80) 75% Hereford x 25% Brahman (75H:25B, n = 80), and 50% Hereford x 50% Brahman (50H:50B, n = 80) were sampled serially at four time-on-feed endpoints (84, 98, 112, 126 d) to compare feedlot performance and carcass and palatability traits of Hereford and Hereford x Brahman steers. After slaughter, USDA yield grade and quality grade factors were recorded, and a portion of the longissimus muscle was removed from the left side of each carcass and fabricated into four 2.54-cm steaks for palatability analyses. Paired steaks from each carcass were aged (6 and 18 d after death), and sensory panel and shear force evaluations were performed. At a constant live weight, 100H steers had higher ADG and produced less mature carcasses with smaller longissimus muscle areas and higher marbling scores than did 75H:25B and 50H:50B steers. The 50H:50B steers had the highest (P < .05) values for dressing percentage. Loin steak tenderness and juiciness decreased (P < .05) and shear force values increased (P < .05) as the percentage of Brahman breeding increased. EXtending the postmortem aging period from 6 to 18 d improved shear force values by 20% and panel tenderness ratings by approximately 14%. Beef from steers of the three breeds responded similarly to aging. When Certified Hereford Beef (CHB) specifications were applied, steaks from 100H steers and 75H:25B steers had similar shear force values, suggesting that beef from quarter-blood Brahman crossbred steers could be included in the CHB Program without detrimental effects on product tenderness.
authors.affiliation: Department of Animal Sciences, Colorado State University, Fort Collins 80523, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Sherbeck
authors.forename: J D
authors.initials: JD
authors.lastname: Tatum
authors.forename: T G
authors.initials: TG
authors.lastname: Field
authors.forename: J B
authors.initials: JB
authors.lastname: Morgan
authors.forename: G C
authors.initials: GC
authors.lastname: Smith
mesh_terms: D000375:Aging / Q000502:physiology; D000821:Animal Feed / Q000592:standards; D000818:Animals; D001823:Body Composition / Q000235:genetics / Q000502:physiology*; D001835:Body Weight / Q000235:genetics / Q000502:physiology; D001947:Breeding / Q000592:standards*; D002417:Cattle / Q000235:genetics / Q000254:growth & development* / Q000502:physiology; D003433:Crosses, Genetic; D005524:Food Technology / Q000379:methods / Q000592:standards*; D008297:Male; D008460:Meat / Q000592:standards*; D014481:United States; D016885:United States Department of Agriculture