My vets have advised me to use Baytril in these ways:
15mg/kg once a day for five days
20mg/kg once a day for five days
10mg/kg twice a day for five days
-Kathy
From the AAAP Avian Disease Manual
BOTULISM
(Limberneck; Western Duck Sickness)
DEFINITION
Botulism is an intoxication caused by ingestion of the toxins of
Clostridium botulinum.
OCCURRENCE
1. In birds, botulism occurs frequently in captive pheasants and wild ducks and occasionally in...
I've had necropsies done at UC Davis, and I've also done my own gross necropsies, so I don't just assume it's Marek's. Luckily for me, necropsies are free in CA.
-Kathy
A prominent breast bone means that his has been going on for a quite awhile. Of course it's not good, but it's not the end of the world either. I am available by phone if you decide you want to tube and need help. Have you looked at the tube feeding link yet...
The amount of fluid they need to stay hydrated is about 30ml/kg every 6-8 hours. Do you have a kitchen scale you can weigh her on? That's how I can tell if they're getting enough to eat/drink.
A 5cm crop seems like it might be enough food, but it would be easier for me to say if you could...
I mean this in the nicest way possible, but that's not true... In addition to the "classic" form, I've seen *many* others.
Examples:
Fine one day, can't walk the next, dead in three days even with tube feeding.
Unsteady one day, on their side the next then dead in 24 hours.
Fine one day, not...
Call a lab and ask to speak with an avian pathologist.... The one I send my birds to is always willing to talk with me and they have been very helpful.
-Kathy
Weight loss is what I usually what I see first, but I have had a couple that were fine one day, down the next, so I brought them inside and treated them very aggressively, but they still died and would have died that same day had I not brought them in. It really could be anything, that's why...
Some labs listed by State:
http://www.aphis.usda.gov/animal_health/nahln/downloads/all_nahln_lab_list.pdf
How to send a bird for necropsy
https://www.backyardchickens.com/t/799747/how-to-send-a-bird-for-a-necropsy-pictures
-Kathy
Sorry for your losses.
With all due respect to your vet, she is wrong about your birds being too old to have Marek's, just have her call one of the avian pathologists at The UC Davis Tulare Lab - (559) 688-7543 and they explain it to her . I have a necropsy report that lists the cause of...