Thanks everyone for the responses. I have read the Markus Jayne info which is very well documented. I wasn't sure if that was recently authored or something from a while back. Just wanted to make sure that with all the breeders, hobbyists, etc., that there wasn't any enhancement on it.

It seems as if the most concrete milestone in the process is the pre-lay shed. That being said, it is entirely predicated on the certainty that an ovy occured in which the following shed is then the pre-lay shed. However, if you think they had an ovy and you are mistaken or miss the ovy, then what? Thats why I was trying to see if I could recognize more of the chronological order of things happening. A string of milestones, if you will?