Milk and dairy products are the major source of saturated fatty acids (SFA) in the European diet and there is evidence that replacing SFA with cis-monounsaturated fatty acids (MUFA) will improve risk factors for cardiovascular disease. Rapeseed in dairy cow diets simultaneously reduces milk SFA and increases cis-MUFA, but also increases milk trans MUFA. A new variety of rapeseed with higher oleic acid content (therefore less potential for increasing milk trans-MUFA) was compared with a normal oleic acid rapeseed, and both compared with a control diet.