title: Comparisons of different myosin heavy chain types, AMPK, and PGC-1α gene expression in the longissimus dorsi muscles in Bama Xiang and Landrace pigs.
abstract: Bama Xiang and Landrace pigs are the local fatty and lean breeds, respectively, in China. We compared differences in carcass traits, meat quality traits, and myosin heavy chain (MyHC) types in the longissimus dorsi muscles between Bama Xiang and Landrace pigs. This was done in pigs of the same age, using real-time PCR, to investigate the relationship between MyHC fiber types and carcass characteristics, meat quality traits, and the key factors regulating muscle fiber type. Bama Xiang pigs exhibited smaller size and slower growth than Landrace pigs (P < 0.01). We found that the superior meat quality, especially the high intramuscular fat (IMF) content in Bama Xiang pig, was related to elevated type I oxidative muscle fiber content (P < 0.01). In contrast, Landrace pig muscle had a higher glycolytic type IIb muscle fiber content (P < 0.01). MyHC I gene expression was significantly positively correlated with backfat thickness and IMF content (P < 0.01). MyHC IIb was significantly negatively correlated with IMF content (P < 0.05), and positively correlated with carcass yield (P < 0.05). AMP-activated protein kinase and peroxisome proliferator-activated receptor-g coactivator-1a are suggested to be the two key factors regulating muscle fiber type in pigs. Our results indicate that muscle fiber composition is one of the key differences leading to the differences of meat quality between Bama Xiang and Landrace pigs. These results may provide a theoretical basis for further studies of the molecular mechanism underlying the excellent meat quality of the Bama Xiang pig.
authors.affiliation: Laboratory of Animal Genetics and Breeding, College of Animal Science and Technology, Guangxi University, Nanning, China.
authors.forename: Y N
authors.initials: YN
authors.lastname: Huang
authors.affiliation: Laboratory of Animal Genetics and Breeding, College of Animal Science and Technology, Guangxi University, Nanning, China.|Guangxi Academy of Fishery Sciences, Nanning, China.
authors.forename: Q W
authors.initials: QW
authors.lastname: Ao
authors.affiliation: Laboratory of Animal Genetics and Breeding, College of Animal Science and Technology, Guangxi University, Nanning, China.
authors.forename: Q Y
authors.initials: QY
authors.lastname: Jiang
authors.affiliation: Laboratory of Animal Genetics and Breeding, College of Animal Science and Technology, Guangxi University, Nanning, China.
authors.forename: Y F
authors.initials: YF
authors.lastname: Guo
authors.affiliation: Laboratory of Animal Genetics and Breeding, College of Animal Science and Technology, Guangxi University, Nanning, China.
authors.forename: G Q
authors.initials: GQ
authors.lastname: Lan
authors.affiliation: Laboratory of Animal Genetics and Breeding, College of Animal Science and Technology, Guangxi University, Nanning, China.
authors.forename: H S
authors.initials: HS
authors.lastname: Jiang
mesh_terms: D055372:AMP-Activated Protein Kinases / Q000235:genetics; D000818:Animals; D001835:Body Weight / Q000235:genetics; D001947:Breeding; D002681:China; D015870:Gene Expression; D008460:Meat / Q000592:standards*; D018485:Muscle Fibers, Skeletal / Q000378:metabolism / Q000502:physiology*; D018995:Myosin Heavy Chains / Q000096:biosynthesis / Q000235:genetics*; D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics; D013552:Swine / Q000378:metabolism / Q000502:physiology*; D014157:Transcription Factors / Q000235:genetics
chemical_list: D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha; D012333:RNA, Messenger; D014157:Transcription Factors; D055372:AMP-Activated Protein Kinases; D018995:Myosin Heavy Chains