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Title: Intramuscular fat in the 'longissimus' muscle is reduced in lambs from sires selected for leanness
Contributor(s): Pannier, L (author); Pethick, D W (author); Geesink, Geert  (author); Ball, Alexander (author); Jacob, R H (author); Gardner, G E (author)
Publication Date: 2014
Open Access: Yes
DOI: 10.1016/j.meatsci.2013.06.014Open Access Link
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Abstract: Selection for lean growth through Australian Sheep Breeding Values (ASBVs) for post weaning weight (PWWT), eye muscle depth (PEMD) and c-site fat depth (PFAT) raises concerns regarding declining intramuscular fat (IMF) levels. Reducing PFAT decreased IMF by 0.84% for Terminal sired lambs. PEMD decreased IMF by 0.18% across all sire types. Female lambs had higher IMF levels and this was unexplained by total carcass fatness. The negative phenotypic association between measures of muscling (shortloin muscle weight, eye muscle area) and IMF, and positive association between fatness and IMF, was consistent with other literature. Hot carcass weight increased IMF by 2.08% between 12 and 40. kg, reflective of development of IMF as lambs approach maturity. Selection objectives with low PFAT sires will reduce IMF, however the lower impact of PEMD and absence of a PWWT effect, will enable continued selection for lean growth without influencing IMF. Alternatively, the negative impact of PFAT could be off-set by inclusion of an IMF ASBV.
Publication Type: Journal Article
Source of Publication: Meat Science, 96(2), p. 1068-1075
Publisher: Elsevier BV
Place of Publication: The Netherlands
ISSN: 1873-4138
Field of Research (FOR): 070204 Animal Nutrition
070201 Animal Breeding
Socio-Economic Objective (SEO): 970106 Expanding Knowledge in the Biological Sciences
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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