In my experience the HBG, at least in this area, trend heavily towards GSF traits in each subsequent Fx generation. Perhaps in a closely managed setting you could retain more BG characteristics, but I haven't seen that around here. Would be an interesting study for someone to complete.

I do think we have had farms push HBG in many cases where they weren't a good fit for the goals for the pond so they likely did not receive the population attention they needed to manage the offspring properly.