Mine are fed a mixture of : barley, flax seed, black sunflower seeds, safflower, rolled oats and calf manna. I fed approx 1/2-1 teaspoon per day. Of course those who have rabbits outside and during summer need to be concerned of the heat when feeding high protein diets. I recently bought some rabbits that where outside rabbits there entire life. After they where out of quarantine(they are not fed this mixture during quarantine) I noticed a huge difference in there coat & color within a few weeks. I am sure it is partially because of moving from outdoors to the inside rabbitry. The temperature is 10-20 degrees cooler and 25-30% lower humidity. I also give an extra crock that has "bounce back" an electrolyte mixture in there cage, which they love, a few days before a show and they are given that while in the carrier to and from the show.