How are they doing? You can always choose to treat them and watch for a few months. If you have a death you can get the chicken necropsied, and then you should find out for sure what you have. Many of these diseases run in twos, sometimes a chicken can have mycoplasma and coryza, or...
Many times when you want a chicken necropsied, the state vet will euthanize the chicken at no extra cost, but you would need to deliver the chicken there. Just call them and ask questions.
Tractor Supply would not carry the Albon or Di-Methox unless they are better stocked than mine. Mail order online may be the only way to get it. Just give the Tylan for a little longer if you still are seeing illness. People kill chickens by different methods--tie their feet together and put...
Culling is selective removal from the flock, in this case, killing. In case of not wishing to cull, your flock should become "all in and all out," meaning you can't add birds unless they have been vaccinated because they will get it from the carriers. Some of the chickens can get better, some...
Since you mention that your chickens had a "smell" that kind of says coryza to me. Coryza is best treated with Albon or Di-Methos which are brand names for sulfadimethoxine a sulfa drug. Many people consider culling for coryza, since it may never be cured completely, and always will be in the...
Tylan dosage is 10 mg per kg or each 2.2 lb. An 8 lb chicken would get .72 ml or close to 3/4 ml. A first time loading dose of 4 times that much can be given once, and then reduce to 10 mg per kg.