关键词: 石岐鸽；美国王鸽；抗氧化能力；胸肌形态学

Abstract: This study aimed to investigate the differences in systemic antioxidant capacity and pectoral muscle morphology between Shiqi pigeons and White King pigeons. Fifty?two?week?old breeding pigeons and 21?day?old squabs from both breeds were used as experimental subjects. Oxidative stress parameters were measured in the plasma，liver，and crop of the breeding pigeons，as well as in the plasma and pectoral muscle of the squabs. Additionally，the fiber cross?sectional area and diameter of the squabs' pectoral muscle were analyzed. The results are as follows∶1）There were no significant differences in the activities of total superoxide dismutase（T?SOD），catalase （CAT），and glutathione peroxidase （GSH ? Px），as well as the contents of hydrogen peroxide （H2O2） and malondialdehyde（MDA）in the plasma of Shiqi and White King breeding pigeons and squabs（P>0.05）. 2）The H2O2 content in the liver and crop of Shiqi breeding pigeons was significantly lower than that of White King breeding pigeons （P<0.05），and the MDA content in the liver of Shiqi breeding pigeons was lower than that of White King breeding pigeons（P<0.05）. 3）The muscle fiber area and diameter in the pectoral muscle of Shiqi squabs were significantly smaller than those of White King squabs（P<0.01）. 4）The H2O2 content in the pectoral muscle of Shiqi squabs was significantly higher than that of White King squabs（P<0.01）. In summary，the breeding Shiqi pigeons exhibited stronger systemic antioxidant capacity，and their squabs possessed pectoral muscles with a tighter texture. Conversely， the White King squabs demonstrated superior antioxidant capacity and greater potential for pectoral muscle development. This study provides a theoretical basis and technical support for the selective breeding of novel meat pigeon strains，the enhancement of stress resistance，and the optimization of meat quality.

Key words: Shiqi pigeon；White King pigeon；antioxidant capacity；Pectoral Muscle Morphology