Question for racers. I faithfully feed and water with intention. I have healthy birds and never have disease problems that you read about(knocking on wood). Twice a month I use the cheapest plain yogurt (not because it is cheap, but because that is what I was taught) 1 teaspoon per gallon of drinking water as a probiotic. I have heard the arguments mostly from non racers of dairy being bad. I go by the rule if it aint broke don't fix it, but I am looking for proof that other products from supply houses are a better route. What do you use and why?