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| Effect of Electrical Stimulation on Microstructure and Tenderness of Different Yak Muscles during Postmortem Aging |
| WANG Li1, WANG Yutao1, GUO Lijun1, ZHANG Xiuying1, ZHANG Li2,*, WEI Jian1, SUN Baozhong3, YU Qunli2 |
| 1.Key Laboratory of Ecology and Biological Resources in Yarkand Oasis at Colleges and Universities, College of Life and Geographic Sciences, Kashgar University, Kashgar 844000, China; 2.College of Food Science and Engineering, Gansu Agricultural University, Lanzhou 730070, China; 3.Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China |
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Abstract In an effort to study the effect of electrical stimulation on the microstructure and tenderness of different yak muscles during postmortem aging, the histological characteristics and microstructure of supraspinatus (SU), latissimus dorsi (LD) and semitendinosus (ST) muscles from yak carcasses with and without electrical stimulation (ES) were examined at 0–14 days postmortem by HE staining and transmission electron microscopy (TEM) and the shear force was also measured. The results showed that ES caused a significantly greater decrease in muscle fiber diameter and cross-sectional area and a significantly greater increase in intermuscular fiber space for all three muscles compared to the untreated control group. For both the treatment and control groups, the histological characteristics of LD changed the fastest of the three muscles, and the former group showed significant destruction, dissolution and fragmentation of LD muscle fibers and significant rupture of the Z line than did the latter. At 14 days postmortem, the shear force of SU, LD and ST in the ES group was 2.93%, 9.47% and 5.08% higher compared with the control group, respectively. To sum up, this study demonstrated that electrical stimulation could significantly accelerated the destruction and tenderization of yak muscle tissue during postmortem aging and that LD could be tenderized faster than SU and ST.
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2017, Vol. 31 
