I personally feed human grade wheat bran, and in small amounts (it is very high phosphorus, but in small amounts this helps balance out the high calcium in both beet pulp and alfalfa chaff and hay). Wheat bran is higher in easily digestible calories than rice bran, but if you aren't sure about balancing your phosphorus levels then I'd recommend rice bran, as manufacturers tend to balance the calcium phosphorus ratios in rice bran as well as adding some fatty content for weight gain. If you're going to introduce a small amount of bran to the diet, do it slowly, as if you introduce it too quickly it can act as a laxative.
Off the top of my head I can't remember the weights I use (will have to check my feed board!) but my feed equates to roughly a scoop of alfalfa chaff, a quarter scoop of beet pulp (before soaking) and a 100ml scoop of bran, twice daily.
Last edited by minstrel; 01-29-2013 at 02:25 AM.