SAMMANSAETTNINGAR FOER ATT BEFRAEMJA TILLVAEXT HOS DJUR

The growth rate of an animal is stimulated by administering to the animal a growth-promoting amount of a compound of the formula wherein - R1, R2, R3, R4 and R5, 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: wherein R6 and R7, 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; - Y is selected from OQ (wherein Q is hydrogen, C1-C4-alkyl or a cation of an alkali or earth alkali metal, or of a non-toxic organic base); and a group of formula -NR8R9 , wherein R8 and R9 are hydrogen, C1-C4-alkyl, C2-C4 2-hydroxyalkyl or, heterocyclic ring optionally including other heteroatoms; provided that, when X is a ketal group and A is ethylene, the group R8R9 is a group other than morpholino.