Meat lipid profile of steers finished in pearl millet pasture with different rates of concentrate

Abstract

-The objective of this work was to evaluate the meat lipid profile from Devon beef steers finished in pearl millet (Pennisetum americanum) pasture and fed at different rates of concentrate supplementary diet. Twelve steers weighing 270 kg, at 12-month-average initial age, were randomly distributed into three treatments: pearl millet pasture; and pearl millet pasture plus a concentrate equivalent at 0.5 or 1.0% of body weight, with two replicates. Total contents of saturated and unsaturated fatty acids, the polyunsaturated:saturated ratio and other relevant fatty acids as the vaccenic acid, conjugated linoleic acid, omega-3, and omega-6 were not affected by the consumption of a concentrate supplement at 0.5 or 1.0% live weight. However, the 0.5% supplementation level reduced the concentration of dihomo-γ-linolenic fatty acid (C20: 3 n-6), while the 1.0% supplementation level elevated the content of docosahexaenoic (DHA) (C22: 6 n-3) fatty acid, and the omega-6:omega-3 ratio in meat. Consumption of up to 1.0% energy supplementation increases the omega-6:omega-3 ratio in meat from Devon steers grazing on pearl millet pasture.Index terms: Pennisetum americanum, conjugated linoleic acids, fatty acids, omega-3, tropic pasture, wheat bran. Perfil lipídico da carne de novilhos terminados em pastagem de milheto com diferentes taxas de concentradoResumo -O objetivo deste trabalho foi avaliar o perfil lipídico da carne de novilhos Devon, terminados em pastagem de milheto (Pennisetum americanum) e alimentados com dieta suplementar de um concentrado a diferentes taxas. Doze animais, com 270 kg e idade média inicial de 12 meses, foram distribuídos ao acaso, em três tratamentos: pastagem de milheto; pastagem de milheto e suplemento concentrado a 0,5 ou 1,0% do peso corporal, com duas repetições. Os teores totais de ácidos graxos saturados e insaturados, a relação poli-insaturados:saturados e outros ácidos relevantes como o vacênico, o linoleico conjugado, o ômega-3 e ômega-6 não foram influenciados pelo consumo de suplemento concentrado a 0,5 ou 1,0% do peso vivo. Entretanto, a suplementação a 0,5% reduziu a concentração do ácido graxo dihomo-γ-linolênico (C20:3 n-6), enquanto a suplementação a 1,0% elevou o teor do ácido graxo docosahexaenoico (DHA) (C22:6 n-3) e a relação ômega-6:omega-3 na carne. O consumo de até 1,0% de suplemento energético aumenta a relação ômega-6:ômega-3 na carne de novilhos Devon mantidos em pastagem de milheto.Termos para indexação: Pennisetum americanum, ácido linoleico conjugado, ácidos graxos, ômega-3, pastagem tropical, farelo de trigo.

The most important attributes of beef sensory quality and production variables that can affect it: A review

“…Animals fed on grass have higher amounts of 18:3 and long-chain n-3 polyunsaturated fatty acids (PUFA) (Wood et al, 2004). A diet richer in grass and lower in grain or concentrate generates leaner meat, with lower intramuscular fat content, and a lower n−6/n−3 fatty acids ratio (French et al, 2000;Nuernberg et al, 2005;Menezes et al, 2013), as grass-feeding generates a higher percentage of n-3 fatty acids and grain feeding gives muscle with a higher n-6 fatty acids amount (Elmore and Mottram, 2009), nevertheless, as the grassfeeding provides leaner meat the total intake of C18:3 fatty acids is low.…”