I have 2 batches of chicks with sneezing, wheezing symptoms. Came vaccinated and fed medicated feed. My best guess upper respiratory infection. Been cold and wet here. Got oxytetracycline calf scour boluses as can’t get any other antibiotics w/out vet visit. Read here to dose at 800 mg/gallon of water. Pills are 500 mg, so 1 1/2 ground up and dissolved in a gallon of water, no matter how many birds? That would be 750 mg total. I’m a little confused. Have Vet Rx too. Thx for any help!