title: Nutritional composition of the meat of Hereford and Braford steers finished on pastures or in a feedlot in southern Brazil.
abstract: Chemical and mineral composition and the intramuscular fatty acid (IMF) profile of the Longissimus dorsi muscle (LM) of 60 purebred Hereford, 1/4 Braford and 3/8 Braford steers finished either in a feedlot or on improved pastures of the Pampa biome were evaluated. Pastures were improved with the introduction of Lolium multiflorum, Trifolium repens, and Lotus corniculatus. On average, beef from pasture-fed steers presented higher concentrations of the fatty acids C18:3n-3 (P<0.001), C20:3n-3 (P=0.035), total n-3 (P<0.001) and lower n-6/n-3 ratio (P<0.001) in the IMF, and higher Mg and lower K content in muscle relative to those finished in the feedlot. C12:0 concentration in IMF was higher (P=0.027) for 3/8 Braford than the purebred Hereford steers, whereas purebred Herefords presented lower C14:1 (P=0.003) and higher C18:0 (P=0.022) concentrations than the two Braford groups. The meat composition of purebred Hereford and Braford steers was not substantially different; however, beef produced exclusively on improved pastures presented higher concentration of components that are considered beneficial to human health, such as n-3 fatty acids, and a lower n-6/n-3 ratio.
authors: Universidade Federal do Rio Grande do Sul, UFRGS, Departamento de Zootecnia, Av. Bento Gonçalves 7712, CEP 91540-000, Porto Alegre, RS, Brazil.
authors: A K de
authors: AK
authors: Freitas
authors: J F P
authors: JF
authors: Lobato
authors: L L
authors: LL
authors: Cardoso
authors: J U
authors: JU
authors: Tarouco
authors: R M
authors: RM
authors: Vieira
authors: D R
authors: DR
authors: Dillenburg
authors: I
authors: I
authors: Castro
mesh_terms: D000273:Adipose Tissue / Q000737:chemistry; D000821:Animal Feed / Q000032:analysis*; D000818:Animals; D001823:Body Composition; D001938:Brazil; D002417:Cattle; D002784:Cholesterol / Q000032:analysis; D004032:Diet / Q000662:veterinary; D015525:Fatty Acids, Omega-3 / Q000032:analysis; D043371:Fatty Acids, Omega-6 / Q000032:analysis; D008129:Lolium; D000070116:Lotus; D008297:Male; D008460:Meat / Q000032:analysis*; D018482:Muscle, Skeletal / Q000737:chemistry; D009753:Nutritive Value; D014131:Trace Elements / Q000032:analysis; D029921:Trifolium
chemical_list: D015525:Fatty Acids, Omega-3; D043371:Fatty Acids, Omega-6; D014131:Trace Elements; D002784:Cholesterol
keywords: Cholesterol; Fatty acids profile; Feedlot; Grazing; Minerals; Omega-3 fatty acids