Comparison of lipid oxidation, messenger ribonucleic acid levels of avian uncoupling protein, avian adenine nucleotide translocator, and avian peroxisome proliferator-activated receptor-gamma coactivator-1 alpha in skeletal muscles from electrical- and gas-stunned broilers
文献类型: 外文期刊
作者: Xu, L.;Wu, S. G.;Zhang, H. J.;Zhang, L.;Yue, H. Y.;Ji, F.;Qi, G. H.
作者机构:
关键词: broiler;electrical stunning;gas stunning;gene expression;lipid oxidation
期刊名称: POULTRY SCIENCE
ISSN: 0032-5791
年卷期: 2011 年 90 卷 9 期
页码:
收录情况: SCI
摘要: The aim of this study was to compare the effects of stunning methods [electrical stunning (ES) vs. gas stunning (GS)] on lipid oxidation in broiler meat and to investigate possible mechanisms of lipid oxidation by measuring plasma variables, muscle reactive oxygen species (ROS), and TBA reactive substance (TBARS) concentrations, muscle fiber ratios, and mRNA levels of avian uncoupling protein (avUCP), avian adenine nucleotide translocator, and avian peroxisome proliferator-activated receptor-gamma coactivator-1 alpha (avPGC-1 alpha). Arbor Acres broilers (n = 36) were not stunned (control) or were exposed to the following stunning treatments: 40% CO(2) + 21% O(2) + N(2); 60% CO(2) + 21% O(2) + N(2); 35 V, 47 mA, 400 Hz; 50 V, 67 mA, 160 Hz; and 65 V, 86 mA, 1,000 Hz. The ROS level in tibialis anterior (TA; P < 0.05) and the TBARS concentration in pectoralis major (PM; P < 0.01) were decreased in the GS groups compared with the ES groups at 45 min postmortem. However, the TBARS concentrations at 24 h postmortem in the PM and TA groups were not affected by stunning method (ES or GS). Compared with ES, GS caused greater expression of avUCP mRNA (1.47-fold in PM, and 2.41-fold in TA) and avPGC-1 alpha mRNA (1.42-fold in PM, and 2.08-fold in TA). In conclusion, the upregulation of avUCP and avPGC-1 alpha reduced ROS accumulation and lipid oxidation at 45 min postmortem in the skeletal muscles of broilers stunned with hypercapnic moderate oxygenation GS. However, these changes were not sufficient to cause a difference in meat lipid oxidation at 24 h postmortem between broilers stunned with hypercapnic moderate oxygenation GS and those stunned with low-current, high-frequency ES.
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