Same breed, same age, one laying and one not??

I don't think it is anything other than an odd coincidence that one of each type is slower. I think you just have some genetically fast layers and some genetically slower layers. You are still well within normal range for the others to begin laying.

 

Well, I'm no expert, but I think this is pretty common. By 20 weeks, your roosters should be pretty roosterish, so I would bet they are just a little less mature than the ones who are laying.
I have a batch of hens who are 24 weeks and some are laying and some aren't. As they get ready to lay, you'll notice their combs do get fuller looking, so maybe that's why they seem less developed than the others.

Hope this helps - I bet you'll get more eggs any day!

 

If you had 3 start laying at 17 weeks your pretty lucky. Give the others time its nothing to worry about

 

I had a range of several weeks between 3 girls of same breed/age to start laying. Nothing wrong with that. I think by 20 weeks you would have a good idea if you have any roos. Just give it a little more time, they are all individuals and mature differently.

ETA: undercaffeinated here, can't spell.....

 

I was able to tell the cockerels from the pullets at around 3-4 weeks. It was obvious from their comb development.

Of this spring's batch of pullets, all within a week of the same age, only one is laying so far. But I know the others are hens, just maturing a little more slowly then their flock mates.

I wouldn't worry about it. You'd know by now if you had little roosters.

 

I have four older sisters. None of us "started" at the same age either.
To put that in the poultry sense - my adult flock is comprised of all one breed, LF brahmas. The first one to lay was 19 weeks old, just shy of 5 months. The last two to lay were 9 1/2 months old.

 

Quote:I sure hope mine doesn't wait another 3 months.

 

I have 3 EE's...2 started laying weeks ago...one has not laid. Now if I was a betting person I would have bet money on Sweet Checks being the first to lay, not the last!
She has been checking out the nesting boxes and her comb and face are red and she does squat here of late so just maybe I will end up with 3 blue eggs at the same time one of these days!