Dietary polyunsaturated fatty acids modify plasma lipids and red blood cell membrane composition but do not induce ∆6 desaturase mediated conversions in the domestic feline
| dc.contributor | Bauer, John E. | |
| dc.creator | McClure, Melena Kathleen | |
| dc.date.accessioned | 2010-01-15T00:13:20Z | |
| dc.date.accessioned | 2010-01-16T00:57:06Z | |
| dc.date.accessioned | 2017-04-07T19:55:36Z | |
| dc.date.available | 2010-01-15T00:13:20Z | |
| dc.date.available | 2010-01-16T00:57:06Z | |
| dc.date.available | 2017-04-07T19:55:36Z | |
| dc.date.created | 2008-05 | |
| dc.date.issued | 2009-05-15 | |
| dc.description.abstract | This study explored the effects of dietary unsaturated fatty acids on feline lipid metabolism. It was hypothesized that high dietary linoleic acid (18:2n-6, LA) would enhance conversion to arachidonic acid (20:4n-6), enrichment of dietary long chain n-3 FA (LCn-3FA) would affect lipid parameters, and n-3 FAs incorporation may blunt n-6 FA incorporation. Twenty-nine cats were randomized into groups (n = 9, 10, 10), and fed for 28 days with blood collections on days 0, 14, and 28. Experimental diets consisted of a commercial diet, supplemented with 8g oil/100g kibble. Oil supplements and subsequent diets were: high-oleic sunflower (H diet) with 82% oleic acid (18:1n-9), Menhaden fish (M diet) with LCn-3FA, and safflower (S diet) with 75% 18:2n-6. Dietary 20:4n-6 content was: 0.03 for H and S, and 0.09 for M (g FA/kg diet). Nonesterified fatty acid (NEFA), triacylglycerol (TG), total cholesterol (TC), lipoproteincholesterol (LP-C), plasma phospholipid (PL) FAs, red blood cell membrane (RBC) FAs, and ?5 and ?6 desaturase indices were measured. Statistical analyses were performed with SAS PROC MIXED with p < 0.05 determining significance. Neither TC nor NEFA showed significant effects. Diet M resulted in significant TG lowering, despite typically low feline TGs. Similarly, pre-? LP-C (i.e. TG-rich VLDL) was decreased in diet M. Plasma PL FAs revealed significant accumulations of the following: 18:1n-9 in diet H, 18:2n-6 in diet S, and LCn-3FA in diet M. Despite high dietary 18:2n-6, plasma PL 20:4n-6 was not increased in diet S over diets H or M. Increased docosadienoic acid (20:2n-6) in diet S demonstrated that 18:2n-6 chain elongation occurred in deference to its ?6 desaturation further substantiating low feline ?6 desaturase activity. Interestingly, no diet M blunting of 20:4n-6 incorporation occurred because fish oil supplementation provided additional 20:4n-6. Tissue 20:4n-6 content appears to be diet-dependent. Accumulation of eicosapentaenoic acid (20:5n-3), but low affinity for docosahexaenoic acid (22:6n-3) occurred in diet M RBC membranes. After 28 days, plasma PLs reflect dietary intake more readily than RBC membranes. Fish oil supplementation resulted in plasma PL LCn-3FA enrichment and lowered plasma TG concentrations, both of which may have physiological significance in cats. | |
| dc.identifier.uri | http://hdl.handle.net/1969.1/ETD-TAMU-2792 | |
| dc.language.iso | en_US | |
| dc.subject | cat | |
| dc.subject | nutrition | |
| dc.subject | lipids | |
| dc.subject | polyunsaturated fatty acids | |
| dc.subject | red blood cell lipids | |
| dc.title | Dietary polyunsaturated fatty acids modify plasma lipids and red blood cell membrane composition but do not induce ∆6 desaturase mediated conversions in the domestic feline | |
| dc.type | Book | |
| dc.type | Thesis |