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Title: The Genetic Relationships Between Intramuscular Fat Measured in Four Different Lamb Muscles
Contributor(s): Guy, S Z Y  (author)orcid ; Walkom, S F  (author)orcid ; Anderson, F (author); Gardner, G E (author); McGilchrist, P  (author)orcid ; Brown, D J  (author)orcid 
Publication Date: 2019
Open Access: Yes
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Abstract: Intramuscular fat percentage (IMF) is a key determinant of eating quality in red meat. Measures of IMF from the short loin muscle (M. longissimus lumborum, LL) are currently used as selection criteria in Sheep Genetics eating quality indexes. To understand how routine selection on the short loin impacts IMF across the whole carcase, this pilot study examines IMF data collected from three additional muscles from the fore quarter (Muscularis supraspinatus, SS) and hind quarter (Musculus semimembranosus, SM; Muscularis semitendinosus, ST) of the carcase. The heritability of IMF was relatively high and consistent across the SS, LL and ST muscles, and lower in the SM. The genetic correlation estimate between IMF measured in the different muscles were all positive, ranging from 0.49 ± 0.13 to 0.97 ± 0.10. Therefore, IMF measurements from the short loin, which is currently being used as selection criteria for eating quality, will be a useful indicator for IMF across muscles from other parts of the carcase. Further, the genetic selection to increase IMF in one muscle should result in an increase in IMF in the other muscles, although at differing rates.
Publication Type: Conference Publication
Conference Details: AAABG 2019: 23rd Conference of the Association for the Advancement of Animal Breeding and Genetics, Armidale, Australia, 27 October-1 November
Source of Publication: Proceedings of the Association for the Advancement of Animal Breeding and Genetics, v.23, p. 314-317
Publisher: Association for the Advancement of Animal Breeding and Genetics (AAABG)
Place of Publication: Armidale, Australia
ISSN: 1328-3227
Fields of Research (FoR) 2008: 070201 Animal Breeding
Fields of Research (FoR) 2020: 300305 Animal reproduction and breeding
Socio-Economic Objective (SEO) 2008: 830310 Sheep - Meat
Socio-Economic Objective (SEO) 2020: 100412 Sheep for meat
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
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Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Conference Publication
School of Environmental and Rural Science

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