Please use this identifier to cite or link to this item:
https://hdl.handle.net/1959.11/9071
Title: | Sheep genotype, age and muscle type affect the expression of metabolic enzyme markers | Contributor(s): | Gardner, Graham E (author); Hopkins, DL (author); Greenwood, Paul (author); Cake, MA (author); Boyce, MD (author); Pethick, David W (author) | Publication Date: | 2007 | DOI: | 10.1071/EA07093 | Handle Link: | https://hdl.handle.net/1959.11/9071 | Abstract: | The objective of this study was to determine whether genotype, age (4, 8, 14 and 22 months), sex (ewe and wether) and muscle type influence ovine (n = 587) muscle metabolic characteristics. The genotypes represented were Poll Dorsetgrowth × Border Leicester Merino, Poll Dorsetgrowth × Merino, Poll Dorsetmuscling × Merino, Merino × Merino and Border Leicester × Merino. Between 4 and 22 months of age, myoglobin concentration within all muscles and all genotypes doubled, with the bulk of this response occurring between 4 and 8 months of age. Levels in the longissimus thoracis et lumborum (LT) and semimembranosus muscles were double those seen in the semitendinosus (ST) muscle, and Merinos had the lowest myoglobin concentrations of all genotypes. The other aerobic indicator, isocitrate dehydrogenase, had lower activity in the ST compared with the LT, was lower in 22-month-old sheep compared with all other ages, and decreased as selection for leanness increased. Both phosphofructokinase and lactate dehydrogenase activity tended to increase with age, were lower in the ST compared with the LT, and had higher activity in the Border Leicester × Merino sheep. The correlation between the percentage of total myofibre area comprising type 2X myofibres and metabolic markers was far higher for the oxidative indicators isocitrate dehydrogenase and myoglobin, which both decreased as relative area of type 2X fibres increased. However, the strongest correlations were with the relative area of type 2A myofibres, which were consistently high for both oxidative and glycolytic metabolic markers implying positive coregulation with both energy producing pathways. | Publication Type: | Journal Article | Source of Publication: | Australian Journal of Experimental Agriculture, 47(10), p. 1180-1189 | Publisher: | CSIRO Publishing | Place of Publication: | Australia | ISSN: | 1446-5574 0816-1089 1836-5787 1836-0939 |
Fields of Research (FoR) 2008: | 070202 Animal Growth and Development | Socio-Economic Objective (SEO) 2008: | 830310 Sheep - Meat 830311 Sheep - Wool |
Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article |
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