High dietary concentrations of methionine reduce the selenium content, glutathione peroxidase activity and oxidative stability of chicken meat
Skrivan, M.,Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic) | Englmaierova, M.,Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic) | Dlouha, G.,Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic) | Bubancova, I.,Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic) | Skrivanova, V.,Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)
Three experiments (EXP) were conducted using two hundred seventy male chicks Ross 308 in each (90 cockerels per treatment; 3 replications, 30 chickens per pen) for 42, 38 and 35 days. Concentrations of selenium, methionine (Met) and total sulphur amino acids in the control diet were 0.11 mg/kg, 5.65 g/kg and 9.25 g/kg, respectively. Chicks in dietary treatment 2 were supplemented with 0.3 mg/kg of Se (EXP 1, 2 and 3) and in dietary treatment 3 they were supplemented with 0.3 mg/kg of Se and 1 g/kg (EXP 1 and 2) or 2.5 g/kg of DL-methionine (EXP 3). In EXP 1, sodium selenite, in EXP 2 and 3 Se-enriched yeast were used as sources of supplemental Se, respectively. The addition of Se or Se and Met into the diet of broilers did not significantly affect final live weight and feed consumption. Concentrations of Met, cysteine and tyrosine in breast muscle significantly increased with increasing dietary Met conc., whereas isoleucine conc. significantly decreased. Moreover, the addition of inorganic and organic sources of Se increased Se conc. in breast meat. On the other hand, the addition of Met signif. decreased Se conc. in breast meat and signif. reduced glutathione peroxidase activity and oxidative stability of raw breast muscle and breast meat stored for 3 days in EXP 2 and 3.
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