Effects of diets containing sunflower oil and fish oil on lipid metabolism and fatty acid flow to the duodenum of beef steers

Duodenal fi stulated steers were offered grass silage at 14 g/kg liveweight and one of three concentrates at a ratio of 60:40 (forage:concentrate on a dry matter basis): FISH0, FISH1 or FISH2 designed to be iso-lipid and to provide the same amount of sunfl ower oil but increasing amounts of fi sh oil: 0, 1 and 4%, respectively.Fatty acid intakes and duodenal fl ows were examined to determine the effects of fi sh oil on polyunsaturated fatty acid (PUFA) metabolism.Fish oil signifi cantly increased the fl ow of long chain PUFA, conjugated linoleic acid and trans vaccenic acid to the duodenum and decreased the fl ow of stearic acid.Biohydrogenation of linoleic and linolenic acids was not affected by fi sh oil inclusion.