many people breed them together, but it doesn't create a wanted color - also they don't breed true when you cross the two colors (like blue X black and blue X splash or black X splash or Lavander X black - etc etc ) buff is a slightly complicated color and partridge is a complex color with a pattern. Thus theres no telling how partridge when bred to a solid, especially buff - will result in.
They can make very nice offspring, I have a few from a blue rooster carrying the partridge background to a buff hen with partridge background, and have gotten 2 straight nice buffs, an almost red rooster with partridge markings (dark crest, hackles, blue tail and wings, and a bit of blue under fluff) and then I have gotten a straight partridge, a very pale blue partridge, and a few wierd off colored kids. lol.
If your looking for chicks for yourself or know people who just want silkies for pets or flock broodies, go for breeding them. - I have a mixed colored pen, white, black, blue, splash, and buff all together. Will be adding my 2 partridge girls into the pen for next years breedings, unless I find a nice pair to make a seperate pen with and breed true partridges. I breed for fun and pets. - I don't show, and I don't sell my birds as anything other than pet/pet quality birds. I know my flock's offspring won't breed true the next generation.
an example of one of my offspring (blue rooster carrying partridge background X a buff with suspected partridge background)