Modification of mature non-reducible collagen cross-link concentrations in bovine m. gluteus medius and semitendinosus with steer age at slaughter, breed cross and growth promotants. (December 2015)

• Record Type: Journal Article
• Authors: Roy, B.C.; Sedgewick, G.; Aalhus, J.L.; Basarab, J.A.; Bruce, H.L.
• Is Part Of: Meat science. Volume 110(2015:Dec.)
• Page Start: 109
• Page End: 117
• Publication Date: 2015-12
• Subjects: Ractopamine -- Implants -- Pyridinoline -- Ehrlich chromogen -- Collagen -- Meat tenderness; Meat -- Periodicals; Meat industry and trade -- Periodicals; Viande -- Périodiques; Viande -- Industrie -- Périodiques; Meat; Meat industry and trade; Periodicals; 641.36
• DOI: 10.1016/j.meatsci.2015.07.008
• Languages: English
• ISSNs: 0309-1740

Abstract

Abstract: Increased meat toughness with animal age has been attributed to mature trivalent collagen cross-link formation. Intramuscular trivalent collagen cross-link content may be decreased by reducing animal age at slaughter and/or inducing muscle re-modeling with growth promotants. This hypothesis was tested in m. gluteus medius (GM) and m. semitendinosus (ST) from 112 beef steers finished at either 12 to 13 (rapid growth) or 18 to 20 (slow growth) months of age. Hereford–Aberdeen Angus (HAA) or Charolais–Red Angus (CRA) steers were randomly assigned to receive implants (IMP), ractopamine (RAC), both IMP and RAC, or none (control). RAC decreased pyridinoline (mol/mol collagen) and IMP increased Ehrlich chromogen (EC) (mol/mol collagen) in the GM. In the ST, RAC increased EC (mol/mol collagen) but decreased EC (nmol/g raw muscle) in slow growing CRA steers. Also, IMP increased ST pyridinoline (nmol/g raw muscle) of slow-growing HAA steers. Results indicated alteration of perimysium collagen cross-links content in muscle in response to growth promotants. Highlights: Ractopamine decreased pyridinoline in collagen of bovine Gluteus medius . Ractopamine increased Ehrlich chromogen in collagen of bovine Semitendinosus . Steroid implants increased Ehrlich chromogen in collagen of bovine Gluteus medius . Steroid implants increased pyridinoline content in bovine Semitendinosus .