Nutritional composition of the meat of Hereford and Braford steers finished on pastures or in a feedlot in southern Brazil

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• 作者：A.K. de Freitas ; J.F.P. Lobato ; L.L. Cardoso ; J.U. Tarouco ; R.M. Vieira ; D.R. Dillenburg ; I. Castro
• 关键词：Cholesterol ; Fatty acids profile ; Feedlot ; Grazing ; Minerals ; Omega-3 fatty acids
• 刊名：Meat Science
• 出版年：2014
• 出版时间：January, 2014
• 年：2014
• 卷：96
• 期：1
• 页码：353-360
• 全文大小：351 K

文摘

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.