Could be aspergillosis! (sp) that has silent gasping as a symptom, it is caused my fungal/mould spores. doesnt say about treatment but have a read of this:
Aspergillosis (Brooder Pneumonia) Causative Agent: Aspergillus spp. (usually A. Fumigatus)
Method of Spread
Aspergilli are common fungal organisms that grow readily in many types of organic material. Although widespread, they can pose a threat to birds if present in large numbers in the poultry house.
Birds are uniquely susceptible to aspergillosis because of the unique features of the respiratory tract. Birds have a complex system of air sacs that aid air movement through the lungs and help birds achieve light weight necessary for flight.
If large numbers of these fungi or their spores are inhaled, they may begin to multiply in the bird's air sacs and spread to other areas of the respiratory tract.
Signs
Affected birds usually do not cough, but exhibit a characteristic silent gasp. If stressed, their skin can become quite blue because of lack of oxygen. Severe weight loss is often seen.
Treatment and Prevention
Aspergillosis can be prevented by carefully managing the bird's environment.
Manure should not be allowed to accumulate, but should be regularly removed. Moldy bedding or feed must not be used for birds. Coarse bedding is preferable to fine as it produces less dust. Most importantly, feed or bedding that becomes wet should be removed immediately.
Good ventilation, cleanliness, and stress prevention are helpful to prevent this and many other bird diseases. Antifungal drugs are occasionally used on very valuable animals. These medications must be given individually, and treatment is often prolonged and expensive.
this was taken from this web site!
http://www.barnyardhealth.com/resinindompo.htmlDebbie