Question Summary:
Is it still permissible to eat such mushrooms?

Question Detail:

Mushrooms are commonly grown with either horse or pig manure.  Is it still permissible to eat them?

Answer :

In the name of Allah, Most Gracious, Most Merciful

It is permissible to eat such mushrooms.

And Allah knows best

Wassalam

Mufti Ebrahim Desai
Darul Iftaa, Madrassah In'aamiyyah