New birds arriving

[zoo keeper]

OK I basically have this flock of 20 ladies and gentlemen pigeons which are approximately 3 months old. I have been training them since late August and just started flying them two weeks ago. They are vaccinated for PMV and paratyphoid. I have 4 new baby pigeons in the mail. They are 5 weeks old and have not been vaccinated for anything at all.

Is it OK to put them in the loft with my other 20 ladies and gentlemen, or should I keep them caged separately until they are vaccinated? Now if it is OK to put them in there will the older birds pick on them?