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 the cecal pellets are also an excellent source. Rabbits that cannot eat cecal pellets and have an impaired appetite may need more protein than the average rabbit. Dangers Too much protein can put a strain on the kidneys, since they are responsible for excretion of excess nitrogen.
Excess protein can also cause overproduction of cecal pellets by overfeeding the cecal bacteria.
The daily pellet allotment along with freely available hay is probably sufficient protein. This decreases their daily intake of protein, and this should be considered when formulating diets for them. This is because all that extra hair is protein and it takes lots of energy and protein to make it. Angoras will take protein from their own muscle tissue and use it to grow fur. The normal pellet ration and freely available hay are sufficient for most angoras.