Hay, straw and branches all contain high percentages of fiber Fruits and vegetables contain some fiber, however because of their high water content they are not as good a source of fiber as hay. Pellets also contribute fiber to the diet Needs Because of the above reasons, bunnies should be allowed free access to all the hay they wish to eat. However, grass hays are also suitable for young, growing bunnies. If a rabbit seems uninterested in grass hays, alfalfa hay is a reasonable alternative. Protein Functions Protein is essential to make a bunny.
Proteins help make bone and muscle and fur, they also are responsible for turning food into energy.
Proteins are important for the proper functioning of the cecal bacteria Types Proteins are composed of amino acids. There are 20 common amino acids, some of which are synthesized by rabbits and others that are not. Those which bunnies cannot make are called essential amino acids. The diet provides a significant portion of these amino acids. However, the cecal bacteria can make the essential amino acids and thus the cecal pellets are also an excellent source.