This project primarily aimed to explore the general potential of sunflowers as silage for dairy cattle, and their effect on milk fat content. In this context, we mainly focused on sunflowers as a main crop for roughage. Additionally, this project sought to assess the possibilities of growing sunflowers as a second crop, following winter cereals. Winter cereals are usually harvested in the second half of June when used as GPS (probably meaning feed) on dairy farms. This therefore requires late sowing when it comes to sunflower cultivation. This project thus included two cultivation trials, in which both variety selection and sowing time were central. The trials showed that a late sowing time does carry some risk of yield loss due to increased disease pressure, bird damage, and poor ripening of the crop. This leads to grain losses, and consequently also a loss of feed value. In this project, four practical plots were also monitored, and the yield was fed to the dairy cattle. Analysis of the milk then taught us that feeding sunflower silage can lead to a fatty acid profile that shifts somewhat towards unsaturated oleic acid. This benefits the spreadability and quality of dairy products.