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Table 2 Effect of gas stunning methods on serum variables in broilers

From: Gas stunning with CO2 affected meat color, lipid peroxidation, oxidative stress, and gene expression of mitogen-activated protein kinases, glutathione S-transferases, and Cu/Zn-superoxide dismutase in the skeletal muscles of broilers

Serum variables2 Stunning methods1 P-value
Control G40% G79%  
Cortisol, ng/mL 2.21 ± 0.23 a 3.72 ± 0.33 b 2.33 ± 0.21 a < 0.01
Uric acid, mg/mL 205 ± 17.8 a 304 ± 26.2 b 298 ± 13.1 b < 0.01
FT3, fmol/mL 2.29 ± 0.40 1.24 ± 0.14 1.82 ± 0.44 0.14
FT4, fmol/mL 3.14 ± 0.50 a 5.21 ± 0.79 b 3.74 ± 0.41 ab 0.07
T3, ng/mL 1.11 ± 0.08 b 0.67 ± 0.03 a 0.85 ± 0.06 ab 0.03
T4, ng/mL 38.5 ± 2.03 41.4 ± 4.00 41.2 ± 4.43 0.51
T3/T4, % 2.87 ± 0.20 b 1.56 ± 0.12 a 2.26 ± 0.25 ab 0.06
FT3/FT4, % 77.3 ± 7.4 c 24.7 ± 2.73 a 49.3 ± 4.8 b <  0.01
  1. 1Control = without stunning; G40% = 40% CO2 + 21% O2 + 39%N2; G79% = 79% CO2 + 21% O2
  2. 2FT3, FT4, T3, T4 represent free triiodothyronine, free thyroxine, triiodothyronine, and thyroxine, respectively
  3. a–bMeans with no common superscripts within a row differ significantly (P ≤ 0.05) or exhibit differences that approach significance (0.05 < P < 0.10); n = 6; values are expressed as the means ± S.E.M