It is possible that is a F4 HBG or maybe a F3. Meadowlark also saw good growth for HBG in later generations. More work and practical research needs to be done on this topic.
It seems one benefit of such a study, if it is found the later F generations are not a problem, mixing BG and HBG during initial stocking might not be such a bad management option.
From what I have read on this forum, for the most part mixing BG and HBG during initial stocking is generally frowned on. But it might actually be a management option if a person was more certain of the outcome of any crosses.
