I have a flock of many breeds, whites, browns, blacks, greys and katmogets
They generally split by colour, not by breed, I can guarantee when I walk in a field there will be two seperate flocks, coloureds (blacks, browns, greys) and whites (white, cream, white with freckles)
Some of my ewes this year have had 1 black twin and one white twin, they still seem to hang with the ewes of the colour that they themselves are
When I had very different sheep together (zwartbles with shetlands) they didnt mingle at all, I think mine mingle more as they arent very different to eachother
I sometimes have groups of twos and threes, they all survive, I had my rams in a group of three until yesterday when the charmoise decided he would prefer to live with the cull ewes....