Effects of supplementation with two sources and two levels of copper on meat lipid oxidation, meat colour and superoxide dismutase and glutathione peroxidase enzyme activities in Nellore beef cattle

Autor(es)

Correa, Lisia Bertonha ^[1] ; Zanetti, Marcus Antonio ^[1] ; Del Claro, Gustavo Ribeiro ^[1] ; de Paiva, Fernanda Alves ^[2] ; Silva, Saulo da Luz E. ^[1] ; Netto, Arlindo Saran ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Coll Anim Sci & Food Engn FZEA, BR-13635900 Pirassununga, SP - Brazil

^[2] Fed Inst Educ Sci & Technol Rio Grande IFRS Serta, Rio Grande do Sul - Brazil

• Tipo de documento: Artigo Científico
• Fonte: BRITISH JOURNAL OF NUTRITION; v. 112, n. 8, p. 1266-1273, OCT 28 2014.
• Citações Web of Science: 2

Resumo

In the present study, thirty-five Nellore bulls were used to determine the effects of two levels and two sources (organic and inorganic) of Cu supplementation on the oxidative stability of lipids, measured by the thiobarbituric acid-reactive substance (TBARS) test, meat colour and superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) enzyme activities. The following treatments were used: (1) control (C) - basal diet without supplementation of Cu (7mg Cu/kg DM); (2) I10 - basal diet supplemented with 10mg Cu/kg DM in the form of copper sulphate (inorganic form); (3) I40 - basal diet supplemented with 40mg Cu/kg DM in the form of copper sulphate; (4) O10 - basal diet supplemented with 10mg Cu/kg DM in the form of copper proteinate (organic form); (5) O40 - basal diet supplemented with 40mg Cu/kg DM in the form of copper proteinate. Lipid oxidation was determined in meat samples exposed to display, modified atmosphere (MA) and vacuum packaging (VC) conditions and in liver samples using the TBARS test. These samples were also evaluated for meat discolouration after exposure to air. The activities of SOD and GSH-Px enzymes were determined in liver samples. In display, MA and VC conditions, the TBARS values of samples from animals supplemented with 40mg Cu/kg DM were lower than those of samples from control animals. There was no effect of treatment on the colour variables (L{*}, a{*}, b{*}). There was also no significant effect of treatment on hepatic TBARS concentrations and GSH-Px activity. Supplementation with Cu at 40mg/kg, regardless of the source, induced higher hepatic SOD activity compared with the control treatment. In conclusion, Cu supplementation improved the oxidative stability of lipids in samples exposed to display, MA and VC conditions, demonstrating the antioxidant effect of this mineral. (AU)

• Processo FAPESP: 06/50898-0 - Efeitos da suplementação de diferentes fontes e níveis de cobre no desempenho, status de Cu, metabolismo e oxidação de lipídios em bovinos
• Beneficiário: Lisia Bertonha Correa
• Modalidade de apoio: Bolsas no Brasil - Doutorado