Effects of abomasal infusion of flaxseed (Linum usitatissimum) oil on microbial β-glucuronidase activity and concentration of the mammalian lignan enterolactone in ruminal fluid, plasma, urine and milk of dairy cows
Côrtes, C., Da Silva-Kazama, D., Kazama, R., Benchaar, C., Dos Santos, G., Zeoula, L.M., Gagnon, N., Petit, H.V. (2013). Effects of abomasal infusion of flaxseed (Linum usitatissimum) oil on microbial β-glucuronidase activity and concentration of the mammalian lignan enterolactone in ruminal fluid, plasma, urine and milk of dairy cows, 109(3), 433-440. http://dx.doi.org/10.1017/S0007114512001341
Ruminal microbiota plays an important role in the conversion of plant lignans into mammalian lignans. The main mammalian lignan present in the milk of dairy cows fed flax products is enterolactone (EL). The objectives of the present study were to investigate the effects of abomasal infusion of flax oil on the metabolism of flax lignans and concentrations of EL in biological fluids of dairy cows. A total of six rumen-cannulated dairy cows were assigned within a 2Â ×Â 3 factorial arrangement of six treatments utilising flax hulls (0 and 15·9Â % of DM) and abomasal infusion of flax oil (0, 250 and 500Â g/d). There were six periods of 21Â d each. Samples were collected during the last 7Â d of each period and subjected to chemical analysis. Flax hull SUPPL.ementation increased concentrations of EL in ruminal fluid, plasma, urine and milk, while flax oil infusion had no effect. Post-feeding, β-glucuronidase activity in the ruminal fluid of cows infused with 250Â g flax oil was significantly lower for cows fed hulls than for those fed the control diet. The present study demonstrated that the presence of a rich source of n-3 fatty acids such as flax oil in the small intestine does not interfere with the absorption of the mammalian lignan EL and that lower ruminal β-glucuronidase activity had no effect on the conversion of flax lignans into EL in the rumen of dairy cows. Copyright © Cambridge University Press 2012. This is a work of the Canadian Government and is not subject to copyright protection in Canada..
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