Angora Rabbits in Hawaii - Hillside Farm Hawaii
Tropical rabbit forage-based feeding?
How about mullberry? Or what I would call sweet potatoes (Ipomoea batatas). I think both of those do well in the tropics?
I have no idea what grows where you are, but some tropical forages are notoriously nutrient (fat/protein) poor. I know people in costa rica who ship in alfalfa hay for horses because the local forage looks lush and green but the animals get skinny on it. I think this is a real research project, and you should compile a list here for future reference!
I was trying to figure out why it is that tropical forage can be so low nutrient, with all that sun and rain, but I just realized some of our higher nutrient forages are storing food for winter, or making seeds that overwinter--I suspect that having a cold season makes plants behave that way, while the tropics are never cold enough to require it.