The invention relates to a process for incorporating additives to feeds, such additives being medicinal materials, by the application of a mixture comprising medicinal material and an adjuvant compound on the surface of the feeds, wherein the mixture is continuously produced immediately before its application on the feed, and wherein said mixture is obtained by suspension in the air of the medicinal material, in the form of powder or granulate, and the liquid adjuvant compound, in the form of droplets or mist.