Recently I started adding organic unfiltered (with the 'mother') apple cider vinegar to my 12 week old chickies water. I started using it because as I understand it, it boosts their immune system and digestive system....you know, good for what ails ya'! I add 1 TBSP ACV per gallon of water. Is this the correct dosage? What results have you noticed in your birds? Why do you use ACV?