Could it be

[SassyT]

We have 6 leg horns and 1 BR"Ethel" and 1 BO "Lucy", The ladies are all in the same coop and have been for several months. The Leg horns are not very nice to Lucy and Ethel and I am wondering if this is why they are not laying yet. the 6 Leg horns started laying in September and Lucy and Ethel are about 2 months younger so we thought we should start to see eggs soon. We see their feathers in the box where the others lay but no brown eggs. Do BR and BO's take longer to start laying?

 

[faykokoWV]

My BO took forever to start laying, she was a little over 6 months old before I got the first egg.

Leghorns are bred for egg laying and are very good at it!

 

[Cindy in PA]

I have had BOs, BRs, leghorns, EEs, Sexlink & RIRs over the last 17 years. All breeds have had at least some of the flock start just shy of 20 weeks. Sexlink strarted at 18. Can't remember any that weren't laying by 22 weeks.