Animal feed and process

A process for obtaining increased meat, milk, egg or wool production in healthy animals comprising the administration to a healthy animal a long acting composition containing an effective amount of a compound of the formula ##STR6## wherein X is N;

• Y is CR.sub.5 ;
• R is alkyl of from 1 to 8 carbon atoms, inclusive, including isomeric forms thereof;
• R.sub.1 is R or ##STR7## R.sub.2 and R.sub.3 are the same or different and are hydrogen, provided that R.sub.2 and R.sub.3 are not both hydrogen, R, cycloalkyl of from 3 to 8 carbon atoms, inclusive, alkyl substituted cycloalkyl of the formula
• --C(CHR.sub.7)n,
• alkenyl of from 2 to 8 carbon atoms, inclusive, including isomeric forms thereof, aralkyl wherein
• Ar is phenyl or substituted phenyl wherein 1 or 2 hydrogens are replaced with chlorine, fluorine, bromine, iodine, R, --OR, or CF.sub.3, and the substituents can be the same or different, and alkyl is from 1 to 4 carbon atoms, inclusive, including isomeric forms thereof;
• and P.sub.2 and R.sub.3 taken together with --N<
• is a heterocyclic moiety of from 3 to 8, inclusive, ring atoms and 1 or 2 hetero atoms selected from the group consisting of nitrogen, oxygen or sulfur or a substituted heterocyclic moiety wherein 0, 1, 2, or 3 of the carbon atoms of the heterocycle are substituted with R;
• R.sub.4 is hydrogen, ##STR8## alkenyl of from 2 to 8 carbon atoms, inclusive, including isomeric forms thereof, cycloalkyl of from 3 to 7 carbon atoms, inclusive, or lower acyl wherein acyl is up to and including 5 carbon atoms;
• R.sub.5 is hydrogen, R, bromo or chloro;
• R.sub.6 is hydrogen, ##STR9## or lower acyl;
• R.sub.7 is hydrogen or alkyl of from 1 to 5 carbon atoms, inclusive, including isomeric forms thereof;
• n is an integer of from 2 to 7, inclusive, said composition being in the form of an implant, bolus, or sterile injectable.