Just slowly reduce the Bil-Jac each day until you are on the *_new food*___ exclusively. During the switching process, you don't have to make sure the calories are exact, just make sure he's on about 1 and 1/2 cups once he only eats the _*new food*__. For example, if you are feeding 2 cups *_previous food*__:
Day 1: 1 and 3/4 cups Nutro 1/4 cup EP Power (mix kibble together)
Day 2: 1 and 3/4 cups Nutro 1/4 cup EP Power (mix kibble together)
Day 3: 1 and 1/2 cups Nutro and 1/2 cup EP Power (mix kibble together)
Day 4: 1 and 1/2 cups Nurto and 1/2 cup EP Power (mix kibble together)
Day 5: 1 cup Nutro and 1 cup EP Power (mix kibble together)
Day 6: 1/2 cup Nutro and 1 and 1/2 cups EP Power (mix kibble together)
Day 7: 1 and 1/2 cups EP Power