Composting

Depends what the farmer thinks about it, no problem for the compost.

I compost just animal manures and they rot down well in the plastic bins. I don't add other stuff though so I know it's just going to be manure and nothing else.  I have a bin just for kitchen stuff, which I like as it's weed free

Yes that's always what comes to mind with manure - see John's comments here and there's a link to pictures of what happened on his allotment.