We analysed historic data from the Agroscope forage crop-breeding programme. A joint analysis of plot trials installed between 1991 and 2015 was performed, revealing the performance of variety candidates produced before or during this period. Linear regression analysis between trait performance and year of production of the variety candidates was then performed. Positive response to selection was found for most traits and species. In red clover (Trifolium pratense), average progress in dry matter yield (DMY, sum per year) was more than double in the second compared to the first main season, which may be attributed to strong selection for increased persistence and resistance to detrimental diseases like southern anthracnose (Colletotrichum trifolii). In tetraploid ryegrasses (Lolium ssp.), progress in DMY was similar for the second and first main season, resulting in a 2.9 to 4.1% increase per decade. In contrast, in diploid ryegrasses, progress in DMY was mostly lower or insignificant. Further results for different species are presented.
