Is that 18% protein?
Well, it sounds very rich, imho could be a good food for growing meat rabbits fast. Also, with meat rabbits, corn isn't such a problem since there's no worry about long term liver issues.
If you feed it to a normal pet rabbit I would only give small amounts, like 1/2 or 1/3 of that that is commonly referred to hay based pellets. Growing rabbits can do with rich stuff, but
in my opinion the stuff that makes them grow fastest isn't the best, besides aforementioned case.
Have you any oportunity to introduce them to forage (that's what I do)? Means, access to untreated green grass and weeds, and no wild rabbit population close (unfortunatly, the number of deseases keeps growing)
A good booster for kits is plain kitchen oatmeal, better composition than corn.
Then there is the thing with corn, it may be overblown by internet dynamics (one says BAD, thousands copy and repeat). The thing seems to be that it depends if each lot is checked for mycotoxins since it molds very easily and badly (sometimes still on the stalks in wet weather, or when not dried properly, stored damp etc.) which can't be noticed when harvested and processed. I reckon that's more a theoretical point since although it's possible, as far as I know it doesn't happen regulary, and is less an issue when big quantitys are processed, compared to growing corn in the backyard where microclimate and weather can spoil the whole harvest. Anyway, as far as I know , good food mills screen for it.
Anyway, imho pet rabbits do not need this calories anyway.
I'm no eypert on pellets, I must say, I feed very little of it, but I wonder if that's the best.
With one month, I would just feed what their mother gets. They already got the right bacteria to digest that. Food chinges around weaning are imho not a great idea.
Note that I use "imho" and "my opinion a lot", not without reason
, do read a lot of different stuff, and not the things repeated most are actually true...