Journal
ANIMAL SCIENCE JOURNAL
Volume 85, Issue 7, Pages 770-779Publisher
WILEY-BLACKWELL
DOI: 10.1111/asj.12207
Keywords
glycolytic potential; hormone; meat quality; muscle-fiber type; pig
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Funding
- Initiation Foundation Project of Chinese Education Ministry
- earmarked fund for China Agriculture Research System [CARS-36-05B]
- Sichuan Sci & Tech Support Program [2012NZ001, 2013NZ0041]
- Animal Husbandry Institute of Ganzi Tibetan Autonomous Prefecture, Sichuan, China
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The objective of this study was to evaluate the effects of muscle-fibre types and hormones on glycolytic potential and meat quality traits and their association with glycolytic-related gene expression in three different altitude pig breeds. The pig breeds studied were the Tibetan pig (TP, high altitude), the Liang-Shan pig (LSP, middle altitude) and the Duroc x (Landrace x Yorkshire) cross (DLY, flatland). The results indicated that TP and LSP had better meat quality than DLY (P < 0.01). The glycolytic potential (GP) increased in the order of TP < LSP < DLY and decreased with time post mortem. DLY had higher glucagon and epinephrine contents than LSP and TP (P < 0.01). The proportions of myosin heavy chain muscle fibers type I in the Longissimus dorsi increased in the order of DLY < TP < LSP, whereas the proportion of type IIb increased in the order of TP < LSP < DLY. The expression of gene PKM2 played an important role in the glycolysis rate of the different genotypes. Compared with the other two pig breeds, the high-altitude breeds had better meat quality attributes, which may be due to the slow rate of glycolysis metabolism.
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