title: Contribution of myofibrillar and connective tissue components to the Warner-Bratzler shear force of cooked beef.
abstract: Myofibrillar (MF-SF) and connective tissue (CT-SF) peak shear forces were interpolated from Warner-Bratzler shear force (SF) deformation curves of cooked bovine M. gluteus medius (GM) and M. semitendinosus (ST) from 112 crossbred steers in a 2×2×2 factorial experiment examining the interactions between slaughter age, growth promotants and breed cross (British versus Continental). Mixed model analyses, Pearson correlations and stepwise multiple regression identified relationships between shear forces, meat quality measurements and production treatments. Connective tissue contribution to SF increased with slaughter age and implantation in the ST and with slaughter age only in the GM. Myofibrillar contribution to SF increased with slaughter age for the ST and with Continental genetics for the GM. Variation in ST SF and MF-SF was best described by muscle weight, which increased with animal age, while GM SF and MF-SF variation was best described by cooking loss, indicating that ST and GM SF were most affected by connective and myofibrillar proteins, respectively.
authors: Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada T6G 2P5.
authors: I
authors: I
authors: Girard
authors: H L
authors: HL
authors: Bruce
authors: J A
authors: JA
authors: Basarab
authors: I L
authors: IL
authors: Larsen
authors: J L
authors: JL
authors: Aalhus
mesh_terms: D000818:Animals; D002170:Canada; D002417:Cattle / Q000254:growth & development*; D055598:Chemical Phenomena; D003238:Connective Tissue / Q000737:chemistry* / Q000187:drug effects; D003433:Crosses, Genetic; D004343:Drug Implants; D063427:Food Quality; D013006:Growth Hormone / Q000008:administration & dosage / Q000494:pharmacology; D006133:Growth Substances / Q000494:pharmacology; D006358:Hot Temperature; D008297:Male; D008460:Meat / Q000032:analysis*; D055595:Mechanical Phenomena; D008954:Models, Biological; D024510:Muscle Development / Q000187:drug effects; D009210:Myofibrils / Q000737:chemistry* / Q000187:drug effects; D010627:Phenethylamines / Q000494:pharmacology; D033081:Shear Strength; D014867:Water / Q000032:analysis
chemical_list: D004343:Drug Implants; D006133:Growth Substances; D010627:Phenethylamines; D014867:Water; C073294:growth hormone, bovine; C060897:ractopamine; D013006:Growth Hormone