Wow! Thanks so much everybody!
I'd never visited this particular veterinary clinic before, but I was so pleasantly surprised! The vet was a fellow backyard chicken owner/lover, and he listened very carefully to all the nuances. We found that she also has a problem with her heart, so chances are that she has some other issues here or there.
You were so right: I can now intubate a chicken! The vet very patiently showed me how to do that, and I came straight home with Little Miss Crossbeak and did it solo--nobody even holding her for me! How refreshing to get that crop full in 1 minute rather than 30 minutes!! This may be doable!
Also, the vet got out a dremel and used the grinding bit and actually ground down that lower beak for me. Her tongue did touch it a bit, which may have heated her up, but it didn't seem to hurt her. She was just a little freaked out by the whole ordeal. I don't blame her! But I now have some great guidance on how to do that, as well!
Finally, he gave me some guidance on feeding amounts and frequencies:
- At each feeding, we have to be guided by the size of the crop. We want to fill 'er up, but not stretch 'er out. No bras here. Right now, she can have 10-15 ml/feeding.
- The number of feedings is guided by the amount she should be eating for her age. She has a lot of catching up to do! I'll be tube feeding 3-4 times a day until she gains some weight. Hopefully by then her crop will be able to handle closer to 20 ml at a time, and eventually we should be able to get away with 2-3 feedings per day.
Doable! I may not be able to do a third feeding every day, but two I definitely can do, especially now that I know how to intubate. I'm so glad he showed me how to do that. I've heard horror stories about human intubations, but chickens' anatomy is different enough that I no longer feel apprehensive about it. She doesn't like the tube going down, but she's not in pain.
So: we have a plan for how much and how often to feed her. I now know how to dremel her bottom beak down, too, and I'll probably have to keep that up weekly. But it's nowhere near as onerous a task as I once thought.
I'll keep everyone posted here on how things go. Thank you to EVERYONE!!