Premixture for ruminants Colimet is a product containing methionine and rumen-protected choline. Methionine is extremely important in dairy cow’s nutrition since it is the first limiting amino acid. A supplement of rumen-protected methionine allows to ameliorate the ration amino acid profile. Choline and methionine are two substances that can detoxify liver from fat infiltrations due to the transfer of lipid deposits. Along with a properly balanced diet, the use of lysine and methionine in high-performance dairy cows helps to increase milk production as well as its content of protein and fat.