VSS, with Shetlands at the moment, it's a bit of a numbers game and genotype is at least as important as phenotype.
There was vast overuse of a few bulls in the past (and recently
) so there was a bit of a genetic bottleneck. Because we used a, AI bull that was completely unrelated to the problem bulls and produced a bull calf of an unusual colour (but one of the traditional Shetland colours that was all but lost when everyone decided to select for black and white), he is genetically useful to the breed.
We had intended to castrate him, but on the advice of the breed society, we're making him available for one breeding season, during which he will cover a small number of selected cows with suitable genetics.
Hopefully, he will also turn out to be a good example of the breed in terms of the standard and in temperament.