My 6 month old hen started wheezing and sneezing today. I've separated her from the flock. The feed store sold me Neovet 325 (neomycin) to put in her water, but I can't determine the correct amount of powder to use per gallon of water. The packet says to use one packet per every 7,150 lbs of body weight.....I have one small hen to dose... Does anyone have experience with this medication? After buying the neomycin, I also heard about Parimicin and Agrimicin - any recommendations as to which is best? Thank you!