It is an in-arguable fact that heterosis masks genetic faults in a first cross. The cross of two very good fault free purebred lines will give very good results. But where are the fault free lines ? Greyhounds and Border Collies ?
None of this is 'Good theory' it is proven fact. Remember Gregor Mendel and his crosses of sweet peas from high school lessons. It has been know for a long time
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