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.
通过给动物注射化合物的生长
促进剂量来刺激动物的生长速度,该化合物的
化学式为##STR1##其中R.sub.1,R.sub.2,R.sub.3,R.sub.4和R.sub.5可以相同也可以不同,分别选自氢,具有1至4个碳原子的烷基,具有1至4个碳原子的烷氧基和卤素的群;X选自羰基和具有以下式子的ketal基团##STR2##其中R.sub.6和R.sub.7可以相同也可以不同,分别选自氢和具有1至3个碳原子的烷基;A是具有1至8个碳原子的线性或支链烷基;R.sub.8和R.sub.9可以相同也可以不同,分别选自氢,具有1至4个碳原子的烷基或2-羟基烷基,其中烷基具有2至4个碳原子,或者R.sub.8和R.sub.9连同氮原子形成一个杂环环,可选地包括其他杂原子;前提是当X为ketal基且A为
乙烯时,基团##STR3##是除morpholino之外的基团。