Are Chickens Halal?
If most of the feed is pure, it is permissible to eat it, and there is nothing wrong with that. But if most of its feed is naajis (impure) — this is what the scholars call “an animal that feeds on filth” — it is not permissible to eat unless it has been detained and fed with taahir food that will make its meat good. Source: https://islamqa.info/en/answers/149059/ruling-on-eating-chicken-that-was-fed-hormones-or-ground-meat
Thank you very much for your prompt replies with the common view though