title: Comparison of energy metabolism and meat quality among three pig breeds.
abstract: 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×(Landrace×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.
authors.affiliation: College of Animal Science and Technology, Sichuan Agricultural University, Ya'an, Sichuan, China.
authors.forename: Linyuan
authors.initials: L
authors.lastname: Shen
authors.forename: Huaigang
authors.initials: H
authors.lastname: Lei
authors.forename: Shunhua
authors.initials: S
authors.lastname: Zhang
authors.forename: Xuewei
authors.initials: X
authors.lastname: Li
authors.forename: Mingzhou
authors.initials: M
authors.lastname: Li
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Jiang
authors.forename: Kangping
authors.initials: K
authors.lastname: Zhu
authors.forename: Li
authors.initials: L
authors.lastname: Zhu
mesh_terms: D000818:Animals; D001947:Breeding; D002352:Carrier Proteins / Q000235:genetics / Q000502:physiology; D004734:Energy Metabolism / Q000235:genetics*; D004837:Epinephrine / Q000032:analysis; D063427:Food Quality; D015870:Gene Expression; D005838:Genotype; D005934:Glucagon / Q000032:analysis; D006019:Glycolysis / Q000235:genetics*; D008460:Meat / Q000032:analysis; D008565:Membrane Proteins / Q000235:genetics / Q000502:physiology; D018485:Muscle Fibers, Skeletal; D018995:Myosin Heavy Chains; D013552:Swine / Q000235:genetics*; D013963:Thyroid Hormones / Q000235:genetics / Q000502:physiology; D000097810:Thyroid Hormone-Binding Proteins
chemical_list: D002352:Carrier Proteins; D004837:Epinephrine; D005934:Glucagon; D008565:Membrane Proteins; D018995:Myosin Heavy Chains; D013963:Thyroid Hormones; D000097810:Thyroid Hormone-Binding Proteins
keywords: glycolytic potential; hormone; meat quality; muscle-fiber type; pig