I have never fed anything medicated...like I just posted, I feed chick starter to all chickens when I have little ones joining the flock...my hens continued to lay great eggs. She may not be laying because you are trying to integrate some new ones in? The chick starter shouldn't have anything to...
exactly what I do....I feed layer feed to all, with a side of oyster shells...IF I am integrating new chicks into the flock I switch all back to chick starter and supplement again with oyster shell....my hens and roos, are healthy and very happy...no illnesses as of yet....