Rural Gardening: The Eggs are in The Bator!, 1 by mcamden

mcamden wrote:
Yes. The yolks will start to expand as the chick developes. A good indication that the egg is 'bad' is when the yolk itself appears to swim in the egg...if it is no longer round it is probbably bad as well.

Here is a pic of an egg I just canded...day 10. The eye of the embryo is the lowest black dot, and the dark shadow that fills the egg except for the air sac (where the light is shining up). You can see the edge of the yolk at the top of the egg. At this stage the yolk takes up about half of the entire egg.