AbstractA study of the analytical results obtained with 1244 samples of silage, examined for advisory purposes during four seasons, has shown interesting relationships between dry matter, crude protein and pH values, and the influence of summer rainfall on these properties. A dry season tends to give a large proportion of samples that have a high dry‐matter content and a low protein content and pH, whereas the converse holds good for a wet season. The results indicate that the best conservation is secured with herbage containing more than 20% of dry matter.