Hi Remy, we sold a ram a few years back that was used a lot in a commercial flock as well as with a few pedigree ladies. The lady that purchased him, breeds the crossbreds to a texel tup and then gets 50% black and 50% white market lambs, she told me that when she took them to Shrewsbury market it would be better to split the white and the black lambs even though they were essentially the same other than the colour. She was really pleased that she got an extra £10 per head for the black lambs! I am not sure how that worked but sounds like there isn't too much colour prejudice at Shrewsbury market - or maybe there is in favour of black! The purebred Zwartbles don't tend to do so well at market as they don't have the confirmation given by a terminal sire, although having said that if they are done well and sold off the ewe they can do very well.