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https://hdl.handle.net/1959.11/9035
Title: | Influences on the loin and cellular characteristics of the 'm. longissimus lumborum' of Australian Poll Dorset-sired lambs | Contributor(s): | Greenwood, Paul (author); Davis, JJ (author); Gaunt, GM (author); Ferrier, GR (author) | Publication Date: | 2006 | DOI: | 10.1071/AR04316 | Handle Link: | https://hdl.handle.net/1959.11/9035 | Abstract: | Offspring of 4 Poll Dorset rams differing in eye muscle depth estimated breeding values (EBVs) were studied to determine sire, sex, and nutritional influences on cellular characteristics in the 'longissimus lumborum' muscle. At 12 weeks of age, 62 lambs were individually fed a concentrate diet with or without protected nutrients ad libitum for 120 days while 39 lambs were grazed on improved pasture. Sire influenced the percentages of type 2A and 2B/2X myofibres, but not myofibre number or size. Progeny of the highest eye muscle depth EBV ram had less type 2A and more 2B/2X myofibres than the lowest ranking sire. At equivalent carcass weight, amount of RNA and protein in the longissimus muscle was influenced by sire, consistent with differences in eye muscle depth EBVs. Sex had little effect on muscle cellular characteristics, whereas lambs fed pasture had less type 1 myofibres than those fed concentrates and had less muscle RNA and a higher ratio of protein to RNA. The findings demonstrate differences in 'm. longissimus lumborum' cellular characteristics in offspring of sires differing in muscle EBVs. The extent to which these differences relate to the Carwell muscle hypertrophy gene remains to be determined. | Publication Type: | Journal Article | Source of Publication: | Australian Journal of Agricultural Research, 57(1), p. 1-12 | Publisher: | CSIRO Publishing | Place of Publication: | Australia | ISSN: | 1444-9838 0004-9409 1836-5795 1836-0947 |
Fields of Research (FoR) 2008: | 070702 Veterinary Anatomy and Physiology 070202 Animal Growth and Development |
Socio-Economic Objective (SEO) 2008: | 830310 Sheep - Meat | 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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