An object of the invention is a feed by means of which milk production of cows and milk fat content can be increased. Preferably at the same time milk protein content is increased. Preferably also the trans fatty acid content of milk fat is lowered. The feed according tothe invention contains, in addition to conventional feed ingredients and conventional additives and other auxiliary agents, inside and on the surface of feed raw material particles a fatty acid mixture in which the content of saturated fatty acids is more than 90 %. The invention is also directed to a process for preparing said feed as well as to a method for changing milk fatty acid composition, for increasing milk production and for increasing milk fat content and increasing milk protein content.