does anyone know if it,s o.k. to feed pigs kidneys to pregnant and nursing bitches and if o.k. raw or cooked

Yes it is fine. I feed them raw one day a week. small quantities though as they can sometimes go straight through, and the eye of a needle springs to mind :D

Yep, kidneys from any source are fine, raw or cooked. I feed mine raw as I hate the smell of cooked kidneys even more than cooked liver.................