Well, my doves like to kiss and cuddle and coo and lay eggs. But this is the third time the eggs have cracked, or been crushed, or just laid in the wrong spot (while on a high perch...drop, splat). I've come home to find Sugar happily sitting in a pool of yolk, with her chest feathers all yellow. What a mess. She seemed oblivious.
So I think the shells aren't thick enough?
Or...
1. Not enough padding in the nest first time.
2. Not separating the couples so they crowded the nest first time, knocking eggs around and cracking them.
3. Not enough protein and calcium /weak shells.
4. Sugar was sick with canker and very tired, and decided to destroy the eggs on purpose to prevent disease.
5. Eggs were weak due to Sugar's illness.
6. Sugar is too tubby and crushed them.
7. Sugar is not very bright.
8. Sunita (other female?) is really a boy.
9. Too much inbreeding.
(Ps. Sugar responded to the medicine and got better. Seems my birds all got it even though I separated them.)
So most people have over breeding issues, I have under breeding issues.
I'd like to have a couple of young doves to hand train.
