Journal article
The effect of genotype and plane of nutrition on the rate of pH decline in lamb carcasses and the expression of metabolic enzymatic markers
Australian Journal of Agricultural Research, Vol.57(6), pp.661-670
2006
Abstract
The objective of this study was to establish the effect of sire (n = 9) estimated breeding values (EBVs) and pasture-based nutritional systems (low and high quality and availability) from birth to slaughter on the metabolic characteristics and post-mortem pH changes in muscle of ~8-month-old lambs (n = 56). Nutritional restriction resulted in a general decrease in glycolytic capacity as indicated by the enzymes phosphofructokinase and lactate dehydrogenase (LDH), suggesting greater metabolic efficiency. Alternatively, it also depressed oxidative capacity as indicated by myoglobin and isocitrate dehydrogenase, which aligns with the histological results suggesting a fast glycolytic fibre type characteristic of less mature animals. Increasing PEMD EBV resulted in a marked shift towards a metabolically more glycolytic muscle type as demonstrated by LDH, although this did not correspond strongly with an increase in the proportion of type 2B fibres based on histological assessment of myofibre type using immunostaining of myosin heavy chain isoforms. Myoglobin concentration aligned with this trend, decreasing in all muscles as PEMD EBV increased, suggesting that selection for muscling will lead to a whiter muscle appearance. Rate of pH decline was increased in the low nutrition lambs, and through selection for PEMD EBV, this response aligning with the metabolically more glycolytic muscle type.
Details
- Title
- The effect of genotype and plane of nutrition on the rate of pH decline in lamb carcasses and the expression of metabolic enzymatic markers
- Authors/Creators
- G.E. Gardner (Author/Creator)D.W. Pethick (Author/Creator)P.L. Greenwood (Author/Creator)R.S. Hegarty (Author/Creator)
- Publication Details
- Australian Journal of Agricultural Research, Vol.57(6), pp.661-670
- Publisher
- CSIRO
- Identifiers
- 991005544805207891
- Copyright
- 2006 CSIRO
- Murdoch Affiliation
- School of Veterinary and Biomedical Sciences
- Language
- English
- Resource Type
- Journal article
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46 Record Views
InCites Highlights
These are selected metrics from InCites Benchmarking & Analytics tool, related to this output
- Collaboration types
- Domestic collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.51 Dairy & Animal Sciences
- 3.51.206 Meat Quality
- Web Of Science research areas
- Agriculture, Multidisciplinary
- ESI research areas
- Agricultural Sciences