I must admit I haven't come across the term 'growth feed' previously, but I assume it means a feed specially formulated for junior bunnies. I think all of the main rabbit food companies market a food for junior bunnies within their range, the difference being that it is higher in protein i.e. for a growing bunny.
I can't see that the requirements would be different for a giant than for any other breed of the same age, as long as you adjust the quantity. So, if it were me, I think I would select one of the junior pellets for her.
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