Nowadays, we expect excellent performance of our livestock animals. The key in livestock production is to optimize performance without compromising animal health while reducing the environmental impact. Improving lactation parameters of dairy cows or growth performance of beef cattle, is only possible when high quality rations are provided. Formulating high quality rations is a challenge in itself. This can only be done by the correct finetuning of roughage and concentrates, with usage of high quality raw materials and feed ingredients. Optimization of the microbial fermentation processes in the rumen will not only support animal performance, it can also minimize the release of green-house gasses. Different feed additives can be offered to support rumen health and animal performance, leading to higher production efficiency, animal health and reduced environmental impact.