The sensory attributes of the raw milk are of major importance for the quality of the resulting dairy products. Since the early 90’ies, the so-called “blueberry off-flavour” has caused severe economic consequences for affected dairy farmers. The mechanism behind is still unclear, although forages of poor hygienic quality and the associated microflora have been suggested to play a role. Forage quality and the naturally occurring microflora of forages are also believed to contribute to the uncontrolled and costly variation in flavour development of Swedish premium cheese; in this case, due to insufficient numbers of flavour producing lactobacilli. In this context, the effect of the botanical composition of forages and the process of ensiling on development of desirable and non-desirable flavours in milk and cheese, need to be adequately addressed. The objective of the proposed project, is to optimise forage management as one measure to increase profitability of the Swedish dairy sector.