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HI this is DRB and I would be happy to help you with this. The answer is really pretty simple. The domestic act really has a very sensitive GI tract and does best when fed a high quality food without ever changing it unless there is some compelling reason such as a medical problem to do so. If you ever change foods (which I do not advise unless you are switching to a better food) always use the following formula:
Day 1,2: 25% new food, 75%old food
Day 3,4: 50/50
Day 5,6: 75% new food, 25% old food
Day 7: new food
Hope this helps but let me know if you have additional questions as I check my computer each night. Sincerely, DRB
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