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Farmers used to, and some still do, cull any bc puppies who weren't black and white. It was thought the black and whites were better workers or something of the sort. Either way, that's the reason the other colors are not as common, and the reason they stand out at all- because the black and whites were chosen over them for the longest time.
your history is a little off here, there are not many coloured BCs because the genes are recessive, so if you are breeding only for working ability the chanced of puting 2 dogs together that carry the recessives are pretty slim. farmers didnt need to cull cooured pupsbecause it was very rare to get them in the first place. then there is the probability that of one coloured pup in the litter growing up to be breeding worthy. when their are 8 pups in a litter and say only 1-2 of then grow up to be breeding worthy and only oe of those pups is coloured, the odds are not in favor of the coloured pup going on to be bred. what farmers culled were the dogs that couldnt do the work, coloured or not. thats not to say their isnt a bias toward black and white dogs, there is, but that not WHY there is so few coloured BCs.