Somewhere to find average first egg by chicken variety?

MIChickandGuinea

Songster
Jun 28, 2017
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Western Michigan
I am wondering when to start watching each kind of chicken I have for their first egg. I know there is a lot of variability in the start of egg laying based on breed, time of year they hatched, diet, hours of daylight, etc. But is there a chart somewhere that shows the average ages for different breeds to start laying eggs? I have 17-week-old pullets, one of whom has already been laying daily for 8 days. They are:
2 Isa Browns (though someone on here said maybe not REAL Isa Browns, maybe a generic sexlink) - 1 of these Isas is the one who has been laying eggs already, but the other Isa has a MUCH more developed/bright comb and wattle, so they didn't start laying in the order that physical indicators would have made me think would happen).
2 Black Marans
2 Easter Eggers
1 White Leghorn (whose comb and wattle are extremely well-developed and bright red - looking at her, I'd have thought she'd be the first to lay an egg, and last week, she was doing a lot of daytime nest box investigation, but once the Isa started actually laying eggs, she doesn't seem interested any more)

Any experienced Chicken Ladies or Chicken Chaps on here who have rough guidelines on when I might expect to see eggs from the various ladies in my coop?
 

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