What is the ruling on feeding chickens worms and blood?
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Question : This person says that some people feed chickens worms and blood.
Answer : As for the worms, if they did not originate from impure matter, they are pure. They are permissible for these chickens because they are like feed. As for the blood, if it is impure blood, one must look at the situation: if it constitutes the majority of their food, these chickens become *jalalah* (animals that eat impure waste), which must be detained and fed pure food for three days before being eaten.
Answer : As for the worms, if they did not originate from impure matter, they are pure. They are permissible for these chickens because they are like feed. As for the blood, if it is impure blood, one must look at the situation: if it constitutes the majority of their food, these chickens become *jalalah* (animals that eat impure waste), which must be detained and fed pure food for three days before being eaten.
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، لقاء[7 من 7] ما حكم إطعام الدجاج دوداً ودماً؟!! الشيخ ابن عثيمين - مشروع كبار العلماء — youtube.com
The Arabic text is a machine transcription of the audio recording.