Lipid and selenium sources on fatty acid composition of intramuscular fat and muscle selenium concentration of Nellore steers

Revista Brasileira de Zootecnia

Angélica Simone Cravo Pereira²  Marcos Veiga Dos Santos²  Gabriela Aferri¹  Rosana Ruegger Pereira Da Silva Corte¹  Saulo Da Luz E Silva¹  José Esler De Freitas Júnior¹  Paulo Roberto Leme¹  Francisco Palma Rennó² 

[1] ,Universidade de São Paulo Faculdade de Medicina Veterinária e Zootecnia Departamento de Nutrição e Produção AnimalPirassununga São Paulo ,Brazil

关键词: antioxidant;    cattle;    longissimus;    soybean seed;    sunflower seed;    whole cottonseed;   

DOI  :  10.1590/S1516-35982012001100009

来源: SciELO

【 摘 要 】

The objective of this study was to evaluate the effect of lipid and selenium sources in diets for finishing Nellore steers on the fatty acid composition and selenium concentration of the longissimus muscle. Fifty Nellore steers (body weight = 458±39 kg) were assigned to one of six dietary treatments: 1) diet containing sunflower seed and inorganic selenium; 2) sunflower seed and organic selenium; 3) whole cottonseed and inorganic selenium; 4) whole cottonseed and organic selenium; 5) soybeans and inorganic selenium; and 6) soybeans and organic selenium. Diets were formulated with the same amount of nitrogen and calories and supplied once daily to steers in collective pens, with three animals per pen, for 120 d. At the end of the trial, steers were slaughtered and samples of the longissimus muscle were collected for fatty acid and selenium analysis. Effect of selenium sources was detected for selenium concentration in the longissimus muscle. Organic selenium had higher concentrations in the meat compared with inorganic selenium. The total saturated, monounsaturated and polyunsaturated fatty acids did not differ between the sources of lipids and selenium. For selenium sources, no differences were observed between the concentrations of polyunsaturated fat. Also, no differences in C18:2 cis-9 trans-11 concentrations were noted; however, steers fed sunflower seed presented greater proportions of this fatty acid in the meat. The results indicated that the use of sunflower seed, cottonseed or soybeans and organic or inorganic selenium in feedlot diets to Nellore cattle does not alter the great part of the fatty acid profile of the longissimus muscle. However, the inclusion of sunflower seed in the diet increases the meat CLA cis-9, trans-11, which is desirable and beneficial for the health of consumers.

【 授权许可】

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