Looking first at conditions affecting the outside of the bird, one of the most common is scaly-face. This is caused by a mite which burrows into the flesh around the cere. Birds can carry the mite with no ill-effect for years and then something goes wrong and the mites very rapidly increase in numbers; scaly-face develops and spreads to other birds. Affected birds have crusty growths around the cere and possibly around the eyes, vent and feet.
The condition is easily diagnosed as the growths are studded with large numbers of small holes through which the mite breathes Any sort of cream applied to the growths will clog up the holes so that the mites will asphyxiate. There are also a number of proprietary medicines available at pet shops which will kill the mites and Ivomectin available from veterinary surgeons, is spectacularly effective.
Lice
Another external condition that affects most budgerigar studs is lice although these do not cause much in the way of illness unless the infection is heavy. The lice eggs can be seen on the underside of the wing particularly if the feathers there are black. Anti-mite sprays applied directly to the birds will clear this up; again Ivomectin is very effective.
Lumps & Swellings
Lumps and swellings on the skin of the bird are usually either abscesses, feather cysts, hernias or tumours. Abscesses in birds do not point as they do in people, and all four of these conditions require surgery by your local veterinarian.
Budgerigars frequently suffer from fractures and dislocations; the bird may hold its wing oddly or have difficulty using one of its legs. These require rapid treatment; if they are left for any length of time in the hope that they will get better the result is often that the bird being is crippled for life. They will require splinting; if you feel confident you can have a go with match sticks and tape. Your veterinary surgeon can also do this and giving the bird an anaesthetic will make his job easier.
Vomiting
Another common condition in budgerigars is vomiting and this is often coupled with playing with the seed and grinding it to a powder rather than eating it. Vomiting budgies show matting of the feathers on the "chin" and also on the top of the head as they flick their beak while being sick. Vomit may also be seen on the walls of the cage and in seed bowls.
There are three common causes of this Condition; a tiny parasite and two moulds. It is important to find out which condition you have as the treatment and outlook is different. Your veterinarian will be able to use some simple tests to identity them and tell which is which A useful guide for the fancier to follow is that if one bird is affected it is probably a mould infection of either the gullet, the crop or the proventriculus (the true stomach). To treat this will require medicine that is only available through the veterinary surgeon.
The crop and gullet conditions are relatively easily cleared up but the stomach condition is more difficult. If more than one bird is affected it is probable that it is the parasitic infection, which is called trichomoniasis. This condition is very easily treated; preparations against canker in pigeons (which is the same disease are available from pet shops and will clear it up, and there are also effective medicines available from your veterinary surgeon. The important thing about this disease is that all the birds must be treated at the same time as many will have the parasite but will not be showing signs of illness.
There is an important lesson to be learnt from trichomoniasis and that is that nearly every case we see has been introduced into the stud by buying in affected birds! They may look fine in the vendor's bird room but the stress of moving to a new home will set off the disease. New birds must be placed in quarantine for at least three weeks before being mixed with the rest of the birds in your stud. It is a good idea also to treat them for trichomoniasis while they are in isolation.
Feather Diseases
A final word on conditions on the outside the bird - feather diseases are common but as yet little is known about either their cause or treatment.