Cometec S.r.l.

Umberto Bucci

Aldo Garzia

The growth rate of an animal is stimulated by administering to the animal a growth promoting amount of a compound of the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5, which can be the same or different, are each selected from the group consisting of hydrogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms and halogen; X is selected from carbonyl and a ketal group of the formula ##STR2## wherein R.sub.6 and R.sub.7, which can be the same or different, are each selected from hydrogen and alkyl having 1 to 3 carbon atoms; A is a linear or branched alkylene having from 1 to 8 carbon atoms; and R.sub.8 and R.sub.9, which can be the same or different, are each selected from the group consisting of hydrogen, alkyl having 1 to 4 carbon atoms, or 2-hydroxy-alkyl wherein the alkyl group has 2 to 4 carbon atoms, or R.sub.8 and R.sub.9, together with the nitrogen atom, form a heterocyclic ring optionally including other heteroatoms; provided that, when X is a ketal group and A is ethylene, the radical ##STR3## is a group other than morpholino.

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Milan, Italy

Umberto Bucci