Effect of lipid sources on fatty acid profiles of meat from pasture- and feedlot-finished Nellore bulls

Autor(es)

Fiorentini, G. ^[1] ; Santana, M. O. ^[1] ; Messana, J. D. ^[1] ; Valente, A. L. S. ^[1] ; Harter, C. J. ^[1] ; Rabelo, C. H. S. ^[1] ; Barbero, R. P. ^[1] ; Lanna, D. P. D. ^[2] ; Reis, R. A. ^{[1, 3]} ; Berchielli, T. T. ^{[1, 3]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, UNESP, Dept Anim Sci, Campus Jaboticabal, BR-14884900 Jaboticabal, SP - Brazil

^[2] Univ Sao Paulo, ESALQ, Anim Sci Dept, BR-13418900 Piracicaba - Brazil

^[3] Univ Fed Vicosa, INCT CA, Dept Anim Sci, S-N Campus Univ, Av Peter Henry Rolfs, BR-36570000 Vicosa, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: LIVESTOCK SCIENCE; v. 211, p. 52-60, MAY 2018.
• Citações Web of Science: 0

Resumo

We aimed to compare the influence of two lipid sources (soybean grain {[}SG], and protected fat {[}PF, Lactoplus], based on soybean oil) with a control diet (no lipid supplementation) on the fatty acid (FA) profile (longissimus muscle and subcutaneous fat) of beef cattle finished on grazing pasture or at a feedlot, The study was arranged in a complete randomized design, using 2 x 3 factorial scheme that combined 2 finishing systems and 3 diets. Seventy-eight young Nellore bulls (323.8 +/- 25.4 kg body weight {[}BW] and 21 +/- 3 months of age) were divided at random into two finishing systems: 1) pasture-finishing and 2) feedlot-finishing. The diet containing PF increased CLA in the muscle (P = 0.0002). Pasture-finished bulls fed lipid-supplemented diets had significantly more (P = < 0.0001) subcutaneous saturated fatty acids and polyunsaturated fatty acids (PUFA) in muscle, whereas the PUFA concentration of PF-fed bulls was highest (P = < 0.0001) in subcutaneous fat. The highest (P = 0.0090) concentration of Omega-6 (n6) was observed in the muscle tissue of pasture-finished animals supplemented with SG. However, the lowest concentration (P = 0.0010) of n6 FAs in subcutaneous fat was more evident in pasture-finished animals receiving the control diet. The concentration of C20:5 n3 (EPA) was significantly higher (P = 0.040) in the muscle tissue of animals receiving the control diet in pasture and deposition of EPA was greater (P = 0.0020) in the subcutaneous fat of pasture-finished animals. The highest concentrations (P = < 0.0001) of n3 were observed in the muscle tissue of pasture-finished animals, Animals receiving the control diet in both finishing systems had a lower (P = 0.0051) n6:n3 ratio in muscle tissue. By comparison, feedlot-finished animals showed a higher (P < 0.01) n6:n3 ratio in muscle tissue, and the highest (P = 0.0190) n6:n3 ratio in subcutaneous fat was observed in pasture- and feedlot-finished animals supplemented with PF compared to the control diet. The muscle and subcutaneous fat tissues of feedlot-finished bulls fed the control and SG diets had a significantly higher (P < 0.05) Delta(9)-desaturase C16 index. The lowest (P = 0.0010) elongase concentrations were observed in the muscle tissue of PF-fed bulls, regardless of finishing system. Overall, bulls finished on grazing pasture had a more desirable FA composition. (AU)

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