Et esters Of polyunsatd. omega-3 fatty acids of high alpha-linolenic acid (I) were used as a component of fodder supplements for dairy cows and sheep. The addn. did not result in any changes in basic compn. of milk from the examd. animals, but profitably modified profil of the milk fatty acids. An increase in unsatd. fatty acids content was obsd. in both cases (by 22% in sheep, and by 20% in cow milks). The content of I increased by 42 and 59% in sheep and cows milks, resp.