1
|
Kirkpatrick LT, Gómez JFM, Beline M, Yen CN, Bodmer JS, Wicks JC, Shi TH, Silva SL, Aalhus JL, King DA, Gerrard DE. Muscle of dark and normal beef differs metabolically. Meat Sci 2023; 206:109344. [PMID: 37778129 DOI: 10.1016/j.meatsci.2023.109344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 09/05/2023] [Accepted: 09/12/2023] [Indexed: 10/03/2023]
Abstract
Reduction in muscle glycogen triggered by adverse antemortem handling events alters postmortem energy metabolism and results in a high ultimate pH and dark, firm and dry beef, often referred to as 'dark-cutting'. However, the relationship between atypical dark (AT) beef, postmortem energy metabolism and underlying tissue characteristics remains somewhat unclear. Cattle harvested in the US and Canada representing normal (pH < 5.6), AT dark (pH 5.6-5.8) and dark cutting (DC; pH > 5.8) beef were analyzed for tissue characteristics related to energy metabolism. Results show AT dark beef is more oxidative but similar to normal beef in glycolytic potential and nucleotide abundance. Mitochondria DNA content (P < 0.05, Canada; P < 0.005, US) and oxidative enzymes for DC and AT dark beef were greater (P < 0.01; Canada and US) compared to normal beef. Myoglobin tracked (P < 0.01) with color classification. These findings show both DC and AT beef are inherently more oxidative and raise the possibility that more oxidative muscle may be more prone to develop dark beef.
Collapse
Affiliation(s)
- L T Kirkpatrick
- Virginia Tech, School of Animal Sciences, Blacksburg, VA 24061, USA
| | - J F M Gómez
- Virginia Tech, School of Animal Sciences, Blacksburg, VA 24061, USA
| | - M Beline
- Virginia Tech, School of Animal Sciences, Blacksburg, VA 24061, USA
| | - C-N Yen
- Virginia Tech, School of Animal Sciences, Blacksburg, VA 24061, USA
| | - J S Bodmer
- Virginia Tech, School of Animal Sciences, Blacksburg, VA 24061, USA
| | - J C Wicks
- Virginia Tech, School of Animal Sciences, Blacksburg, VA 24061, USA
| | - T H Shi
- Virginia Tech, School of Animal Sciences, Blacksburg, VA 24061, USA
| | - S L Silva
- Department of Animal Science, College of Animal Science and Food Engineering, University of São Paulo, Pirassununga, SP 13635-900, Brazil
| | - J L Aalhus
- Agriculture and Agri-Food Canada, 6000 C & D Trail, Lacombe, Alberta T4L 1W1, Canada
| | - D A King
- USDA-ARS, Roman L. Hruska US Meat Animal Research Center, Clay Center, NE 68933, USA
| | - D E Gerrard
- Virginia Tech, School of Animal Sciences, Blacksburg, VA 24061, USA.
| |
Collapse
|