When should they lay? SF and LB

[SundownWaterfowl]

I have 7 Light Brahma pullets, and 4 Salmon Faverolle pullets, they are both standard breeds. They turned 21 weeks old last saturday.

When should they start to lay?

The Brahmas combs are starting to get redder, and the brahma roosters are mating with them.

 

[gritsar]

I expected later, but one of my light brahma hens started laying last Wednesday; the day they turned 19 weeks old. All of her (light) sisters are now exhibiting the same strange behavior she was the day she started laying.

 

[10chicks]

I have two buff Brahmas (Abercrombie and Fitch) and they started laying at around 17 -18 weeks. That was two weeks ago and the eggs are still very small.