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- The chick inside the egg has fully developed its air sac, which is located at the large end of the egg.
- The egg should be candled to check for any defects, such as blood spots or cracks.
- The chick has grown and filled most of the egg, leaving only a small amount of space for it to move.
- The eggshell should appear slightly translucent and it’s possible to see veins and shadows through the shell.
- The chick is still getting its nutrients from the yolk, but it has also started to absorb the egg white or albumen.
- The chick is preparing for hatching, which usually occurs between days 19 to 21 of incubation.