i feed my ASF's Step 2 Extruded horse feed. it's $14 CAD for a 50lb bag. i've had the same bag since march and i still have about half of it. i wouldn't suggest buying a big bag of this unless you have somewhere to store it (i have ours in a deep freeze) or tons and tons and tons of rats that will go through it quickly. the rats seem to be doing excellent on it, great litter sizes (13+ pups per litter)

here's the link: http://www.purityfeed.com/pop/detail...=BAFHORSTEP2EX