Effect and mode of action of the Texel muscling QTL (TM-QTL) on carcass traits in purebred Texel lambs
| Autor: | NR Lambe, Lutz Bünger, P. L. Johnson, Stephen Bishop, B. T. Wolf, Oswald Matika, J. M. Macfarlane, W. Haresign |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Veterinary medicine
sheep Genotype QTL biology.animal_breed Quantitative Trait Loci Quantitative trait locus Loin SF1-1100 Animal science Animals genetics muscling Muscle Skeletal biology Sire Chromosome Mapping food and beverages Animal culture Polar overdominance Gene Expression Regulation Chromosomal region Body Composition Texel Animal Science and Zoology Texel sheep Purebred |
| Zdroj: | Animal, Vol 8, Iss 7, Pp 1053-1061 (2014) |
| ISSN: | 1751-7311 |
| Popis: | TM-QTL is a quantitative trait locus (QTL) on ovine chromosome 18 (OAR18) known to affect loin muscling in Texel sheep. Previous work suggested that its mode of inheritance is consistent with paternal polar overdominance, but this has yet to be formally demonstrated. This study used purebred Texel sheep segregating for TM-QTL to confirm its presence in the chromosomal region in which it was first reported and to determine its pattern of inheritance. To do so, this study used the first available data from a Texel flock, which included homozygote TM-QTL carriers (TM/TM; n=34) in addition to homozygote non-carriers (+/+; n=40 and, heterozygote TM-QTL-carriers inheriting TM-QTL from their sire (TM/+; n=53) or their dam (+/TM; n=17). Phenotypes included a wide range of loin muscling, carcass composition and tissue distribution traits. The presence of a QTL affecting ultrasound muscle depth on OAR18 was confirmed with a paternal QTL effect ranging from +0.54 to +2.82 mm UMD (s.e. 0.37 to 0.57 mm) across the sires segregating for TM-QTL. Loin muscle width, depth and area, loin muscle volume and dissected M. longissimus lumborum weight were significantly greater for TM/+ than +/+ lambs (+2.9% to +7.9%; P |
| Databáze: | OpenAIRE |
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