Pro-opiomelanocortin is a prohormone that codes for many different peptides, some of which are involved in the appetite pathway. A single nucleotide polymorphism c.288C>T in pro-opiomelanocortin (POMC) was previously demonstrated to be associated with hot carcass weight (HCW) and shipping weight (Ship wt) in cattle. While developing a commercial real time PCR test for the POMC c.288C>T we identified a 12 bp deletion (POMC c.293_304delTTGGGGGCGCGG). The deletion results in the removal of four amino acids; valine, two glycine, and alanine. The deletion does not cause a frame shift. Both the POMC c.288C>T SNP and the deletion were genotyped in 386 crossbred steers, and evaluated for associations with carcass traits. The animals with one copy of the deletion had a significantly lower end-of-background rib-eye area (P=0.04) and carcass rib-eye area (P=0.03) when compared to animals without the deletion. A significant association with the POMC c.288C>T SNP was found with start of finishing weight (SOF WT); (P=0.04), HCW (P=0.02), average fat and grade fat (P=0.05), carcass rib-eye area (REA); (P=0.03) and marbling (P=0.02). These results suggest that it would be beneficial for beef producers to know both the deletion and the POMC c.288C>T SNP genotypes when making marketing and culling decisions.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:SSU.etd-08182009-143843 |
| Date | 17 September 2009 |
| Creators | Deobald, Heather Maureen |
| Contributors | Laarveld, Bernard, Shand, Phyllis, Buchanan, Fiona, Schmutz, Sheila, Soita, Henry |
| Publisher | University of Saskatchewan |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://library.usask.ca/theses/available/etd-08182009-143843/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to University of Saskatchewan or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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