Some of my birds are retaining the seed in their crop. The droppings are normal, and the birds are hungry?

My pigeons have a problem of vomiting, not eating and then dying?

Over the last 3 or 4 months i have noticed my pigeons have no appetite, from then on they suffer from different symptoms and death?

my young pigeons have jelly droppings and still have food in their crops in the morning and they look terrible. Can you help me?

I raise fantailed pigeons and every year for years I have babies who's crops become filled with this white substance?

Hi! I'm a vet student; I've just necropsied a pigeon and found a green liver with two white plaques. What could be happening?

The birds drink water and the water stays in the crop. The birds crop swells and the bird will die. Could you advise?