Grape pomace (GP) is a source of polyphenols
with powerful antioxidant capacity. An experiment
was conducted to investigate the effect of inclusion
of GP at levels of 5, 15, and 30 g/kg and α-tocopheryl
acetate (200 mg/kg) in a corn-soybean basal diet on
growth performance, protein and amino acid digestibilities;
antioxidant activity of diet, serum and excreta, lipid
oxidation of breast and thigh meats during refrigerated
storage, and liver vitamin E concentration. Growth performance
and protein and amino acid digestibilities were
not affected among the different treatments. Total intake
and digestibility of extractable polyphenols in the birds
fed the GP diet were increased compared with birds fed
supplemented and unsupplemented vitamin E diets. Antioxidant
activity in vitamin E and GP diets and excreta
exhibited higher scavenging free radical capacity than the
control diet using 3-ethylbenzthiazoline-6-sulfonic acid
and ferric reducing antioxidant power methods. Lipid
oxidation (malondialdehyde concentration) in breast and thigh meats was lower in the birds fed the supplemented
vitamin E diet than the control diet after 1, 4, and 7 d of
refrigerated storage. Results showed a linear reduction
of lipid oxidation in breast and thigh meats at 4 and 7 d
with increasing content of GP in the diet. Oxidative stability
in breast and thigh meats at 1, 4, and 7 d of storage
was equivalent or less effective in GP diets compared
with the vitamin E diet. A linear increase was observed
in liver α-tocopherol concentration with increasing content
of GP in the diet, but it was inferior to the supplemented
vitamin E diet. In conclusion, the results showed
that a dietary inclusion rate up to 30 g/kg of GP did not
impair chickens growth performance and protein and
amino acids digestibilities and increased antioxidant activity
in diet and excreta. Grape pomace and vitamin E
diets reduced the lipid oxidation of meat during refrigerated
storage and increased liver α-tocopherol concentration,
although these effects were greater, in some cases,
by adding vitamin E to the diet.
Grape pomace (GP) is a source of polyphenols
with powerful antioxidant capacity. An experiment
was conducted to investigate the effect of inclusion
of GP at levels of 5, 15, and 30 g/kg and α-tocopheryl
acetate (200 mg/kg) in a corn-soybean basal diet on
growth performance, protein and amino acid digestibilities;
antioxidant activity of diet, serum and excreta, lipid
oxidation of breast and thigh meats during refrigerated
storage, and liver vitamin E concentration. Growth performance
and protein and amino acid digestibilities were
not affected among the different treatments. Total intake
and digestibility of extractable polyphenols in the birds
fed the GP diet were increased compared with birds fed
supplemented and unsupplemented vitamin E diets. Antioxidant
activity in vitamin E and GP diets and excreta
exhibited higher scavenging free radical capacity than the
control diet using 3-ethylbenzthiazoline-6-sulfonic acid
and ferric reducing antioxidant power methods. Lipid
oxidation (malondialdehyde concentration) in breast and thigh meats was lower in the birds fed the supplemented
vitamin E diet than the control diet after 1, 4, and 7 d of
refrigerated storage. Results showed a linear reduction
of lipid oxidation in breast and thigh meats at 4 and 7 d
with increasing content of GP in the diet. Oxidative stability
in breast and thigh meats at 1, 4, and 7 d of storage
was equivalent or less effective in GP diets compared
with the vitamin E diet. A linear increase was observed
in liver α-tocopherol concentration with increasing content
of GP in the diet, but it was inferior to the supplemented
vitamin E diet. In conclusion, the results showed
that a dietary inclusion rate up to 30 g/kg of GP did not
impair chickens growth performance and protein and
amino acids digestibilities and increased antioxidant activity
in diet and excreta. Grape pomace and vitamin E
diets reduced the lipid oxidation of meat during refrigerated
storage and increased liver α-tocopherol concentration,
although these effects were greater, in some cases,
by adding vitamin E to the diet.
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