All my chickens are on Tylan Soluable for upper respitory problems. There has been a decline in egg production since they all got sick about 2 weeks ago. My older chickens seem to be a lot better, although the egg production has not gone up (which in a way I'm glad, b/c I don't want to throw eggs away while on Tylan) but I would like to know how long does it usually take to get them all back to normal and laying. Thanks.