Been pouring over it for info...but I had never heard of this.
The suggested "Lock Down" is day 17 instead of 19
Apparently Bantam is likely to hatch a few days earlier than standard birds.
I wasn't sure but decided to leave my standard bird's eggs until a different hatch.
Have you heard of this?

Do you find that Bantam ( Silkie & Show Girl ) hatch a few days earlier?
Want to make sure I stop the egg turner on day 17 IF this is the case.
I must live under a rock....never heard of this before (*o*)