80% of an adult rabbit's diet should be hay. Good quality hay is the most part of a rabbits diet and you're rabbits should Always have access to it. it helps keep their gut moving thus avoiding dangerous gut stasis which left untreated is nearly always fatal.it also keeps their teeth nice and short and in good condition.
Nutrition is next semester! So excited for it actually! I am always examining labels (for my pet food that is...I should care more about myself!). My cats eat well but not so well that I go broke. Hence: labels labels labels!!