Glucopyranosyl and oligoglucosidyl derivatives of 4,6-bisdesoxy-4-(4,5,6-trihydroxy-3-hydroxymethylcyclohex-2-en-1-ylamino)-.alpha.-D-glucopyranose, which are inhibitors of glycoside hydrolases of the digestive tract, favorably improve the meat:fat ratio in animals in favor of a higher proportion of meat. A single amino-sugar or a mixture of amino-sugars can be formulated in combination with an edible carrier and fed to animals. A representative embodiment is a pig feedstuff in admixture with O-{4,6-bisdesoxy-4-[lS-(1,4,6/5)-4,5,6-trihydroxy-3-hydroxymethylcyclohex-2-en-1-ylamino]-.alpha.-D-glucopyranoxyl}-(1.fwdarw.4)-O-.alpha.-D-glucopyranosyl-(1.fwdarw.4)-D-glucopyranose.