Yuck to piglets head! As much as I love my dogs I don't think my stomach would survive that!
I use several butchers for bones & breast of lamb. The bones usually free or small charge but the breast of lamb can work out very expensive. I use the big supermarkets for chickens as they're so cheap (no pun intended lol!).

girls turned their noses up at the pigs head

Cariad keeps looking at hers, Lona has buried hers in the shavings, so it looks like there has been a blizzard outside I have never fed pork to them before, so maybe they are not keen on the smell??? Just come back from a long trek and given them a banana each and then will see if they get stuck in, if they haven't had them by tomorrow I will throw them out as I am worried they will go off, bin day tomorrow so they will be gone quickly

Pinky's head has gone off to the binmen this morning, I left Pinky out for them all day, they have chewed round the edges a bit but that is it. Lona was standing up at the back door last night looking for her tea so I thought well Madam you will have to eat what I have left you, but nope still there this morning so they have had brekkie and a pig's ear each (which they love)
I daren't leave it any longer, weather being so warm, Pork goes off really quick, and like you say Nikki there is the worm side of things to bear in mind as well