Effects of age at slaughter and sire genotype on fatness, muscularity, and the quality of meat from ram lambs born to Romney ewes

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorPurchas, R. W.
dc.creatorSobrinho, AGS
dc.creatorGarrick, D. J.
dc.creatorLowe, K. I.
dc.date2014-05-20T13:18:03Z
dc.date2016-10-25T16:39:22Z
dc.date2014-05-20T13:18:03Z
dc.date2016-10-25T16:39:22Z
dc.date2002-06-01
dc.date.accessioned2017-04-05T19:39:40Z
dc.date.available2017-04-05T19:39:40Z
dc.identifierNew Zealand Journal of Agricultural Research. Wellington: Sir Publishing, v. 45, n. 2, p. 77-86, 2002.
dc.identifier0028-8233
dc.identifierhttp://hdl.handle.net/11449/4300
dc.identifierhttp://acervodigital.unesp.br/handle/11449/4300
dc.identifier10.1080/00288233.2002.9513496
dc.identifierWOS:000176975300001
dc.identifierhttp://dx.doi.org/10.1080/00288233.2002.9513496
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/853599
dc.descriptionRam lambs (n = 356) born to Romney ewes and sired by a range of straightbred or crossbred sires were evaluated for carcass composition and, for a subsample (n = 236), some meat quality characteristics over a period of 4 years. Within each year, 2 to 4 sire genotypes, including Romney controls, were evaluated at 2 slaughter ages (5-9 months and 10-11 months). Weight-adjusted carcass length was greater for lambs with some East Friesian or Finn genes, but no differences were found in dressing-out percent. At a constant carcass weight, carcass fatness (fat depths and leg dissectible fat) was lower in lambs with East Friesian, Texel, or Finn genes. Meat yield at a constant weight tended to be greatest in sire groups that were least fat, and M:B ratio in the femur region was highest in lambs with Texel genes and, to a lesser extent, those with Poll Dorset genes. Leg muscularity in the femur region generally paralleled differences in M:B, except in a comparison of East Friesian-cross and Romney lambs where the former had lower muscularity but slightly better M:B. Lambs slaughtered at the older age for each year had longer and leaner carcasses at the same weight, possibly because they had been taken part way through a winter or because of slower growth rates leading up to slaughter. Meat quality characteristics differed little between the genotype groups, but for 2 of 3 years, meat from the semimembranosus muscle of lambs in the older slaughter lot was significantly tougher.
dc.languageeng
dc.publisherSir Publishing
dc.relationNew Zealand Journal of Agricultural Research
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectlamb fatness
dc.subjectcarcass muscularity
dc.subjectmeat tenderness
dc.subjectsheep breeds
dc.titleEffects of age at slaughter and sire genotype on fatness, muscularity, and the quality of meat from ram lambs born to Romney ewes
dc.typeOtro


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