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| Effects of Postmortem Aging Time on Ultrastructure of Horse Longissimus dorsi Muscle |
| Guzalnur·ASKAR, Batuer·ABULIKEMU, ZHAO Linan |
| College of Food Science and Pharmacy, Xinjiang Agricultural University, ürümqi 830052, China |
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Abstract The Longissimus dorsi muscle of male horses from Zhaosu county of Xinjiang autonomous region was examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) for histologic characteristics during postmortem aging times (1, 3, 7, 14, 21 and 28 days) at 0–4 ℃. The results showed that the thickness of the endomysium was negatively correlated with the thickness of the perineurium; the length of the sarcomere was significantly negatively correlated with muscle fiber diameter and area (P < 0.01), but positively correlated with muscle fiber density. Muscle fiber diameter was negatively correlated with muscle fiber density, but showed a very significantly positive correlation with muscle fiber area (P < 0.01). With the extension of postmortem aging time, the ultrastructure of myofibrils changed, and the arrangement of muscle fibers changed from neat to loose and from clear to messy; at 14 days postmortem, the Z-line began to degrade.
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2020, Vol. 34 
