His interest is in feed evaluation and preservation, especially in the relationship between ensiling silages and dairy cow nutrition. His research focuses on developing methods to reduce nutrient losses at ensiling, increasing forages utilisation and feed efficiency and enhancing net milk income minus feed cost. Previously in his career, Rolf was a National Extension Officer in Dairy Production for 10 years at the Research Information Centre at SLU and before that spent 10 years as Head of Extension at a farmer cooperative in Sweden.