title: Growth and carcass fatty acid composition of beef steers fed soybean oil for increasing duration before slaughter.
abstract: Duration of soybean oil (SBO) supplementation needed to enhance carcass conjugated linoleic acid (CLA) and trans-vaccenic (TVA) content was examined using 96 beef steers (293.6±3.9kg) fed a 78% corn-based diet supplemented with SBO for 0, 77, 137, or 189days before slaughter. Duration of SBO supplementation had no effect (P⩾0.15) on animal performance or carcass traits, nor (P⩾0.15), total, total saturated, or total polyunsaturated fatty acids of Longissimus dorsi (LD). Concentrations of CLA in LD were not affected (P⩾0.18) by SBO supplementation. Concentrations of monounsaturated fatty acids (MUFA) decreased linearly (P=0.03) in LD, whereas TVA increased (P=0.04) in adipose tissue and tended (P=0.07) to increase in LD with increasing duration of SBO supplementation. Supplementing SBO to a concentrate-based diet may enhance TVA without impacting CLA, while reducing the MUFA content of lean beef.
authors.affiliation: Department of Animal Science, University of Wyoming, 1000 E University Ave, Laramie WY 82070, USA.
authors.forename: P A
authors.initials: PA
authors.lastname: Ludden
authors.forename: O
authors.initials: O
authors.lastname: Kucuk
authors.forename: D C
authors.initials: DC
authors.lastname: Rule
authors.forename: B W
authors.initials: BW
authors.lastname: Hess