Tuell Jacob R, Park Jun-Young, Wang Weichao, Cooper Bruce, Sobreira Tiago, Cheng Heng-Wei, Kim Yuan H Brad
Meat Science and Muscle Biology Laboratory, Department of Animal Sciences, Purdue University, West Lafayette, IN 47907, USA.
Division of Applied Life Sciences (BK 21 Plus), Gyeongsang National University, Gyeongsangnam-do 52828, Korea.
Foods. 2020 Feb 19;9(2):215. doi: 10.3390/foods9020215.
The objective of this study was to evaluate the effects of photoperiod on meat quality, oxidative stability, and metabolites of broiler fillet () muscles. A total of 432 broilers was split among 4 photoperiod treatments [hours light(L):dark(D)]: 20L:4D, 18L:6D, 16L:8D, and 12L:12D. At 42 days, a total of 48 broilers (12 broilers/treatment) was randomly selected and harvested. At 1 day postmortem, fillet muscles were dissected and displayed for 7 days. No considerable impacts of photoperiods on general carcass and meat quality attributes, such as carcass weight, yield, pH, water-holding capacity, and shear force, were found ( > 0.05). However, color and oxidative stability were influenced by the photoperiod, where muscles from 20L:4D appeared lighter and more discolored, coupled with higher lipid oxidation ( < 0.05) and protein denaturation ( = 0.058) compared to 12L:12D. The UPLC-MS metabolomics identified that 20 metabolites were different between the 20L:4D and 12L:12D groups, and 15 were tentatively identified. In general, lower aromatic amino acids/dipeptides, and higher oxidized glutathione and guanine/methylated guanosine were observed in 20L:4D. These results suggest that a photoperiod would result in no considerable impact on initial meat quality, but extended photoperiods might negatively impact oxidative stability through an alteration of the muscle metabolites.
本研究的目的是评估光照周期对肉鸡胸肌的肉质、氧化稳定性和代谢产物的影响。总共432只肉鸡被分为4种光照周期处理组[光照（L）：黑暗（D）小时数]：20L：4D、18L：6D、16L：8D和12L：12D。在42日龄时，随机选择并屠宰了总共48只肉鸡（每组12只）。宰后1天，解剖胸肌并放置7天。未发现光照周期对一般胴体和肉质属性有显著影响，如胴体重、产肉率、pH值、持水力和剪切力（P>0.05）。然而，肉色和氧化稳定性受光照周期影响，与12L：12D相比，20L：4D组的肌肉颜色更浅且变色更严重，同时脂质氧化水平更高（P<0.05），蛋白质变性程度更高（P=0.058）。超高效液相色谱-质谱代谢组学分析表明，20L：4D组和12L：12D组之间有20种代谢产物存在差异，其中15种被初步鉴定。总体而言，20L：4D组中芳香族氨基酸/二肽含量较低，氧化型谷胱甘肽和鸟嘌呤/甲基化鸟苷含量较高。这些结果表明，光照周期对初始肉质没有显著影响，但延长光照周期可能会通过改变肌肉代谢产物对氧化稳定性产生负面影响。
