The effects of feeding strategy on subcutaneous, perirenal adipose tissue and ribeye (longissimus dorsi) muscle fatty acid profiles were evaluated from 60 bison (Bison bison) bulls from Western Canada. Treatments included Forage Fed (n=19); short term concentrate feeding, <90 Day (n=9); mixed forage and concentrate feeding, 50:50 Forage:Grain (n=20); and Feedlot Finishing (n=12), and were analyzed for interactions and main effects between treatment and tissue type. Saturated fatty acids were found in larger (P<0.05) proportions within perirenal tissue for all treatments. Polyunsaturated fatty acids were concentrated (P<0.05) in the intramuscular tissue. Polyunsaturated fatty acid content was greater (P<0.05) in Forage Fed and 50:50 Forage:Grain than in <90 Day or Feedlot Finishing treatments. The polyunsaturated to saturated fatty acid ratio was greatest (P<0.05) for Forage Fed followed by 50:50 Forage:Grain, with <90 Day and Feedlot Finishing treatments having the lowest ratio. Linoleic acid content within intramuscular tissue was greatest (P<0.05) in the 50:50 Forage:Grain followed by the <90 Day treatment, with the Forage Fed group being intermediate, and the Feedlot Finishing being the lowest (P<0.05). Subcutaneous tissue contained more (P<0.05) conjugated linoleic c-9, t-11 acid than did intramuscular tissue. The conjugated linoleic c-9, t-11 acid content of intramuscular tissue was greater (P<0.05) in the Forage Fed and <90 Day treatments than in the 50:50 Forage:Grain and Feedlot Finishing treatments. Alpha-linolenic acid content was greatest (P<0.05) in intramuscular tissue of Forage Fed bison than the other treatments. Total omega-3 fatty acid concentration was greater (P<0.05), in the intramuscular tissue of Forage Fed bison, followed by <90 Day and 50:50 Forage:Grain being similar (P>0.05) with Feedlot Finishing having the lowest (P<0.05) content. Eicosapentaenoic, docosapentaenoic, and docosahexaenoic acid were all found in the greatest (P<0.05) proportion in the Forage Fed, and least (P<0.05) in the Feedlot Finishing treatment. </p> <p>The total omega-6 and arachidonic fatty acid content of intramuscular tissue was greater (P<0.05) in the Forage Fed and 50:50 Forage:Grain than in the <90 Day or Feedlot Finishing treatments. The omega-6 to omega-3 fatty acid ratio was greatest (P<0.05) for the 50:50 Forage:Grain followed by <90 Day with Feedlot Finishing being intermediate, and Forage Fed bison having the lowest (P<0.05) ratio. </p><p>Feedlot bison were compared to beef (<i>Bos taurus</i>) steers (n=4) and sheep wethers (<i>Ovis aries</i>) (n=3). Sheep had lower (P<0.05) saturated fatty acid content than did bison or beef in intramuscular tissue. Polyunsaturated fatty acid content of intramuscular tissue was greater (P<0.05) in bison than in beef or sheep. The ratio of polyunsaturated to saturated fatty acids was greater (P<0.05) for bison than for beef or sheep. The omega-6 to omega-3 fatty acid ratio was lower (P<0.05) for the bison than the beef, while sheep were intermediate (P<0.05).</p><p>Forage Fed bison compared to forage fed sheep wethers (n=3) showed that the ratio of polyunsaturated to saturated fatty acids was greater (P<0.05) in bison than sheep. The ratio of omega-6 to omega-3 fatty acids was similar (P>0.05) for both species.</p><p>Forage Fed bison yielded the greatest proportion of beneficial fatty acids amongst the bison treatments. Comparison of species under feedlot and forage finishing systems indicated bison to have a more desirable fatty acid profile than did beef or sheep finished under their respective systems.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:SSU.etd-01042006-114843 |
| Date | 04 January 2006 |
| Creators | Turner, Tyler |
| Contributors | Woodbury, Murray R., Christensen, David A. |
| 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-01042006-114843/ |
| 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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