Lea
It really depends on what you can get in your area.
Down here is Southern Canada.... (LOL) We have Purina and MasterFeed
MasterFeed - Nurse and Grow is a 18% protein feed and it is great for nursing does to keep condition and kits grow fast and strong on it.
This area had an issue with a batch of MasterFeed in January 2016 and we have been assured that it has been fixed, but I'm a bit gun shy after all the losses so I prefer the Purina. (The rabbits prefer the MasterFeed... lol... but I'm the boss, so they get the one that I haven't had issues with)
Purina Performance (17%)- I found out from a rep in the US, at a show, that there is a show blend with a higher protein, but it isn't available at our local feed stores.
TSC I am sure carries something too... but, I have not investigated their feed selection.
Not much help.... lol