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dc.contributor.authorKeane, Michael G.*
dc.contributor.authorDiskin, Michael G.*
dc.date.accessioned2014-07-24T09:27:01Z
dc.date.available2014-07-24T09:27:01Z
dc.date.issued2007
dc.identifier.citationM.G. Keane and M.G. Diskin. Performance and carcass traits of progeny of Limousin sires differing in genetic merit. Irish Journal of Agricultural and Food Research 46: 63–76, 2007en_GB
dc.identifier.issn0791-6833
dc.identifier.urihttp://hdl.handle.net/11019/626
dc.descriptionpeer-revieweden_GB
dc.description.abstractGenetic indices for growth and carcass classification are published for beef sires used in Ireland for artificial insemination (AI). The objective of this study was to compare growth and carcass traits of progeny of Limousin sires of low and high genetic index for growth. A total of 70 progeny (42 males and 28 females) out of predominantly Holstein-Friesian cows by 7 AI Limousin sires were reared together to slaughter. The 7 sires were classified as low (n=3) or high (n=4) index based on their published genetic index for growth. The male progeny were reared entire and all animals were slaughtered at about 20 months of age. Carcasses were classified for conformation and fatness, and a rib joint (ribs 6 to 10) was separated into fat, muscle and bone. Growth rate did not differ significantly between the index groups but tended to be higher for the high index progeny. This higher growth rate, combined with a significantly higher kill out proportion, resulted in carcass weight andcarcass weight per day of age being significantly higher for the high index progeny. Carcass conformation and fat class were not affected by genetic index, nor was the composition of the rib joint. Compared with males, females had a significantly lower growth rate and kill out proportion and, consequently, had a significantly lower carcass weight. The proportions of fat and bone in the rib joint were significantly higher, and the proportion of muscle was significantly lower for females than for males. It is concluded that carcass weight reflected sire group genetic index for growth but feed intake, carcass classification and rib joint composition were not affected.en_GB
dc.language.isoenen_GB
dc.publisherTeagasc, Oak Park, Carlow, Irelanden_GB
dc.relation.ispartofseriesIrish Journal of Agricultural and Food Research;vol 46
dc.subjectBeef cattleen_GB
dc.subjectBullsen_GB
dc.subjectCarcass traitsen_GB
dc.subjectGenetic indexen_GB
dc.subjectHeifersen_GB
dc.titlePerformance and carcass traits of progeny of Limousin sires differing in genetic meriten_GB
dc.typeArticleen_GB
dc.identifier.rmisGEBE-0103-4686
refterms.dateFOA2018-01-12T08:02:30Z


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