frank i get my doos droppings tested 4 or 5 times a year if they need treated they get treated but not on the blind . i maybe came across the wrong way i dont treat before pairing if not needed . also the 6 week peroid you mentioned my doos will get natural preventination not cures as you say the 6 week period is what makes or breaks your season as you know your old birds can have resp with out you knowing it until its to late .