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dc.contributor.author Rius-Vilarrasa, E.
dc.contributor.author Roehe, R.
dc.contributor.author Macfarlane, J. M.
dc.contributor.author Lambe, N. R.
dc.contributor.author Matthews, K. R.
dc.contributor.author Haresign, William
dc.contributor.author Matika, O.
dc.contributor.author Bunger, L.
dc.date.accessioned 2010-03-23T16:32:49Z
dc.date.available 2010-03-23T16:32:49Z
dc.date.issued 2009-11-01
dc.identifier.citation Rius-Vilarrasa , E , Roehe , R , Macfarlane , J M , Lambe , N R , Matthews , K R , Haresign , W , Matika , O & Bunger , L 2009 , ' Effects of a quantitative trait locus for increased muscularity on carcass traits measured by subjective conformation and fat class scores and video image analysis in crossbred lambs ' Animal , vol 3 , no. 11 , pp. 1532-1543 . , 10.1017/S1751731109990413 , 10.1017/S1751731109990413 en
dc.identifier.issn 1751-732X
dc.identifier.other PURE: 146411
dc.identifier.other dspace: 2160/4517
dc.identifier.uri http://hdl.handle.net/2160/4517
dc.description Rius-Vilarrasa, E., Roehe, R., Macfarlane, J. M., Lambe, N. R., Matthews, K. R., Haresign, W., Matika, O., Bunger, L. (2009). Effects of a quantitative trait locus for increased muscularity on carcass traits measured by subjective conformation and fat class scores and video image analysis in crossbred lambs. Animal, 3, (11), 1532-1543. IMPF: 01.46 RONO: 00 Sponsorship: LINK LK0670 / English Beef and Lamb Executive (EBLEX) / Hybu Cig Cymru (HCC) / Quality Meat Scotland (QMS)/ Livestock and Meat Commission for Northern Ireland (LMCNI)/ Scottish Association of Meat Wholesalers /Catapult Genetics /Pfizer Innovis Genetics Ltd /BBSRC BB/E018963/1 /Defra /MLC /Genesis Faraday /Worshipful Company of Woolmen en
dc.description.abstract A quantitative trait locus (QTL) for increased loin muscularity (TM-QTL) has previously been identified in purebred Texel sheep. Crossbred lambs born out of Mule ewes mated to heterozygous Texel sires for the TM-QTL were evaluated for a range of carcass traits. Lambs were genotyped and classified as carriers (n = 62) of a single copy of the TM-QTL and non-carriers (n = 49). In this study, the effects of the TM-QTL on carcass attributes were investigated using subjective classification scores for conformation and fatness, and measurements from a video image analysis (VIA) system. In addition, refined prediction equations to estimate weights of primal joints (leg, chump, loin, breast and shoulder) were obtained by calibrating the VIA system against computer tomography (CT) measurements in the loin region. The new refined prediction models increased the accuracy of prediction of all primal cuts on an average of 16% compared to previously derived standard VIA prediction equations. The coefficient of determination (R2) of the VIA system to predict in vivo CT measurements ranged from 0.39 to 0.72 for measurements of Musculus longissimus lumborum (MLL) area, width and depth, lumbar spine length, loin muscle volume and loin muscularity index. Using VIA estimates of CT-measured loin muscle traits, a significant increase in depth (+2.7%) of the MLL was found to be associated with the TM-QTL. Conformation and fatness scores and the shape of the carcass measured as individual lengths, widths and areas by VIA were not significantly influenced by the TM-QTL. Primal meat yields estimated using both standard and refined VIA prediction equations were not significantly affected by the TM-QTL. However, carcass ‘compactness’ was found to have significantly increased in carrier lambs. The weight of the dissected MLL estimated using VIA information was greater (+2.6%) for carriers compared to non-carriers. To conclude, neither the current industry carcass evaluation system for conformation and fatness nor the standard VIA system is able to identify the effect of the TM-QTL in the loin region in the moment. However, the calibration of the VIA system against CT measurements resulted in improved VIA prediction equations for primal meat yields and also showed moderate potential to estimate loin muscle traits measured by CT and to detect, partially, the effect of the TM-QTL on these traits. en
dc.format.extent 12 en
dc.language.iso eng
dc.relation.ispartof Animal en
dc.title Effects of a quantitative trait locus for increased muscularity on carcass traits measured by subjective conformation and fat class scores and video image analysis in crossbred lambs en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1017/S1751731109990413
dc.contributor.institution Institute of Biological, Environmental and Rural Sciences en
dc.description.status Peer reviewed en


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