Rabbits then excrete special pellets called cecotropes, which they have to consume in order to absorb the nutrition released by the fermentation process. (petconsider.com)
Consult your veterinarian if you see a large number of cecotropes in the cage because your rabbit may be missing vital nutrition. (vin.com)
If the soft cecotropes return no matter what brand you feed, then you may have a rabbit that simply can not tolerate pellets. (vin.com)