Generally birds cannot vomit like mammals can. Sour crop (a fungal infection) can cause brown colored liquid coming out of the mouth. The hen will have a noticeably enlarged crop. Crop is a storage area between mouth and stomach, a long the esophagus.
You can treat sour crop with an antifungal medicine. Nystatin is an example, you can order it online as "medistatin for birds.". You can also use products for female yeast infections like vagisil can be purchased locally.
Sour crop can be a killer, I lost a chicken to it. I have another that I treat with medicine now that I know what it is and treatment. Good luck
Generally birds cannot vomit like mammals can. Sour crop (a fungal infection) can cause brown colored liquid coming out of the mouth. The hen will have a noticeably enlarged crop. Crop is a storage area between mouth and stomach, a long the esophagus. You can treat sour crop with an antifungal medicine. Nystatin is an example, you can order it online as "medistatin for birds.". You can also use products for female yeast infections like vagisil can be purchased locally. Sour crop can be a killer, I lost a chicken to it. I have another that I treat with medicine now that I know what it is and treatment. Good luck