I put a little on her water http://www.tractorsupply.com/tsc/product/oxytetracycline-soluble-powder-6-2-5-oz
my boss said one of his sick have respiratory problem do you think giving them vetRx is good or give another medication ? thanks
Quote: VetRx is usually fine to use. It is not an antibiotic is is more like "vapor rub" for livestock.
If you are going to use antibiotics, then you need to use the proper dosage. For the brand you purchased it is 5 teaspoons per gallon. Only treat birds that are showing illness. It is best to know what they have before treating, so if you have a vet that would be good. Antibiotics won't cure respiratory illness, but can usually take care of any secondary infections that may accompany illness.
Heated water for the chickens is usually a good idea, they drink a lot in winter so they need fresh water all day. A heater will keep it clear of ice. As far as a heat lamp, this is usually not necessary for chickens in winter. Any sick chickens need to be separated and possibly brought into an unheated garage with their own food and water so they can be monitored and have extra attention.
As long a healthy, feathered chickens have a coop that is free of drafts, but well ventilated, they should do fine in cold temps.
Oxy dosage:
https://www.backyardchickens.com/t/1022878/oxytetracyline-and-tetracycline-powder-doses