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Effect of incremental levels of fish oil in the diet on ruminal lipid metabolism in growing steers

Shingield, K.J., Lee, M.R.F., Humphries, D. J., Scollan, N.D., Toivonen, V., Reynolds, C. K. and Beever, D. (2010) Effect of incremental levels of fish oil in the diet on ruminal lipid metabolism in growing steers. British Journal of Nutrition, 104 (1). pp. 56-66. ISSN 0007-1145

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To link to this article DOI: 10.1017/S0007114510000292

Abstract/Summary

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 × 4 Latin square experiment with 21 d experimental periods to examine the potential of fish oil (FO) 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 weight0·75/d containing 0, 8, 16 and 24 g 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-16 : 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.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Agriculture, Policy and Development > Food Production and Quality Division > Animal Science Research Group (ASRG)
Interdisciplinary centres and themes > Food Chain and Health
Interdisciplinary centres and themes > Centre for Food Security
ID Code:17019
Publisher:Cambridge University Press

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