A six-year study by the Thünen Institute of Organic Agriculture in Trenthorst has found that growing maize and runner beans together for livestock feed can increase crude protein content in the feed and improve digestibility compared to pure maize silage. The research, funded by the Federal Program for Organic Farming and Other Forms of Sustainable Agriculture (BÖLN), also found that alternating or mixing planting rows can be effective, but organic farms need to ensure enough row spacing for hoeing. The study also noted that anti-nutritional substances in the harvest were reduced during ensiling, making the silage safe for the animals. The feeding experiments with cows and pigs showed that the use of corn and bean silages can improve milk protein content and provide a good roughage feed option for organic farms.