Digestibility of the organic matter of 10 main grassland species were compared for two years. Samples were collected in field trials during the first growth and during two to three regrowths at three locations at different altitudes. During the first growth cycle, the digestibility of the grass species and of red clover decreased, while white clover and dandelion kept their high digestibility from the beginning to the end. The correlation between the digestibility and the age of the plants as well as the stage of development was high for the first growth of grass and clover. During the regrowths, the digestibility decreased from 0.8 to 3.2 % per week depending on the species. At the beginning of each regrowth (three and five week old forage), the estimation of the digestibility was more accurate than at the end of the regrowths, when the range of variations in digestibility was much higher. Compared to our results, the official Swiss tables of nutritive value underestimate the digestibiity of grass species during the first growth cycle and overestimate the digestibility during regrowth. For the first growth, the digestibility of white and red clover is in correspondence with the tables, but the digestibility is overestimated by the tables for the regrowths.
Tall oat grass and golden oat grass are typical hay-meadow grasses that are also suitable for forage mixtures. Of the four tall and three golden oat grass varieties tested, only one new variety of tall oat grass is likely to make it onto the List of Recommended Varieties.
Stevenel P., Wendling M., Brabant C., Suss H., Savoyat C., Dierauer H., Mascher F., Charles R.
FiBL and Agroscope investigated bread wheat varieties to determine their yield and quality stability. The results show that the choice of variety must be adapted to the site and that high yield potential does not go hand-in-hand with a high protein content.
Adapted and high-yielding varieties of forage plants are important for Switzerland as a grassland country. Hybrid ryegrass is a versatile forage grass that, thanks to breeding advances, has become even more persistent, disease-resistant and high-yielding over the past 30 years.