Journal
BRITISH JOURNAL OF NUTRITION
Volume 104, Issue 1, Pages 56-66Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0007114510000292
Keywords
Biohydrogenation; n-3 Fatty acids; trans-Fatty acids; Conjugated linoleic acid; Fish oil
Categories
Funding
- Department for Environment, Food and Rural Affairs [LS 3511]
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Based on the potential benefits to human health, there is interest in developing sustainable nutritional strategies to enhance the concentration of long-chain n-3 fatty acids in ruminant-derived foods. Four Aberdeen Angus steers fitted with rumen and duodenal cannulae were used in a 4 x 4 Latin square experiment with 21d experimental periods to examine the potential of fish oil (170) in the diet to enhance the supply of 20: 5n-3 and 22 : 6n-3 available for absorption in growing cattle. Treatments consisted of total mixed rations based on maize silage fed at a rate of 85 g DM/kg live weight(0.75)/d containing 0, 8, 16 and 24g FO/kg diet DM. Supplements of FO reduced linearly (P<0.01) DM intake and shifted (P<0.01) rumen fermentation towards propionate at the expense of acetate and butyrate. FO in the diet enhanced linearly (P<0.05) the flow of trans- 6 : 1, trans-18 : 1, trans-18: 2, 20 :5n-3 and 22 : 6n-3, and decreased linearly (P< 0.05) 18:0 and 18: 3n-3 at the duodenum. Increases in the flow of trans-18: 1 were isomer dependent and were determined primarily by higher amounts of trans-11 reaching the duodenum. In conclusion, FO alters ruminal lipid metabolism of growing cattle in a dose-dependent manner consistent with an inhibition of ruminal biohydrogenation, and enhances the amount of long-chain n-3 fatty acids at the duodenum, but the increases are marginal due to extensive biohydrogenation in the rumen.
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