It's all really complicated and I haven't come across a whole lot of information regarding calcium overdose in geese. But from what I found, surplus calcium in laying geese is first stored in the bones, then excreted in the form of extra thick, bumpy and rough egg shells. I don't know for sure...
I'm really sorry to hear this. I was so hoping Natasha would make it.
Boris would probably like a little extra attention until the goslings arrive. My geese love to go for walks (Keld did, too), and even though they're not very attached to me they sure enjoy my company.
Or maybe Boris will...
I'm hoping so much your Natasha pulls through.
Her trouble standing and walking could be from pain and/or an infection of her abdomen.
According to my vet, warm baths are really good. They help relieve the pain and lets her use her strength to pass the egg(s). Also her weight won't squish...
Do you know if she actually eats the oyster shell?
My late goose didn't care for oyster shell, so I baked some mixed with wheat flour and water and fed them to her as treats. She caught on to that, too, and started scrutinizing each treat before eating it. So I mixed the shell in with her feed...