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| Characteristics and Types of Muscle Fibers in Different Parts of Chinese Red Steppe Cattle |
| GUAN Shiyu, GU Xingliang, SHEN Hongxu, MA Yumin, CHENG Lei, QU Lei, QIN Lihong |
| 1.Jinlin Academy of Agricultural Science (Northeast Agricultural Research Center of China), Changchun 130033, China; 2.College of Animal Science and Technology, Jinlin Agricultural University, Changchun 130118, China; 3.Taonan Animal Husbandry Station, Baicheng 137100, China |
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Abstract A comparative analysis was conducted on the characteristics and types of muscle fibers in different parts of Chinese red steppe cattle. Six Chinese red steppe cattle with similar body mass and age were selected and slaughtered. Muscle samples from six different carcass parts including sirloin, outside flat, outside, chuck roll, eye round and flank, were collected for observation under microscope and morphometric analysis through paraffin sectioning, hematoxylin-eosin (HE) staining, and nicotinamide adenine dinucleotide-tetrazolium reductase (NADH-TR) staining. The HE staining method was used to measure and statistically analyze the diameter, cross-sectional area, endomysium thickness, perimysium thickness, and proportion of different muscle fiber types, and differential analysis was conducted. The results showed that there was no significant difference in the cross-sectional area or diameter of muscle fibers between different parts of Chinese red steppe cattle. The perimysium thickness of brisket and sirloin muscles showed significant differences compared to those of the other muscles (P < 0.01). The sirloin and outside flat showed a significant difference in the endomysium thickness of muscle compared to the other parts (P < 0.05). The proportion of type I muscle fibers showed significant differences among different parts (P < 0.05). The proportion of type IIB muscle fibers in the outside and sirloin showed significant differences compared to the other parts (P < 0.01). These findings indicate that there are differences in the characteristics and proportion of muscle fibers among different parts of Chinese red steppe cattle.
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2023, Vol. 37 
