When can I be sure my hen is not rooster?

[fur-mum]

This is entirely new territory for me.

So he'll be "servicing" all the girls (6 of them) and they'll begin laying fertilized eggs. ...some day.

Then???? One day one of them will decide to gather a clutch of eggs together and brood them?

As others have said, the hen will go broody when her hormones say so. It has nothing to do with a rooster being around. My first year, I had no roosters, and my silkie still went broody. So we gave her eggs to hatch.

If he were to "service" the year old hens would they get broody now as the days are already getting shorter?

Doubtful that they'd go broody now, but it's always a possibility. Depends on where you live and lighting conditions, etc.
As for wondering if an egg is fertilized... I don't personally have any good pics, but if you search the forums on here, there are lots to good pics and explanations.

 

[IamRainey]

My girls didn't go seriously broody until this summer. One group is over 2 yrs old the other group 8 months old and j had one go seriously broody couldn't break her for long kept going back broidy so i let her hatch one hatched out of 4 baby is 4 weeks old now

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Oh! I just HOPE I could get that lucky! I'm sure that's a sweet sweet thing to see!

 

[meetthebubus]

Oh! I just HOPE I could get that lucky! I'm sure that's a sweet sweet thing to see!

It is really great I love seeing the dynamic between mama and baby I have 2 vids of the hatching (sort of) in the link in my Sig

 

[IamRainey]

Her soft coloring is just luscious. What is she?

 

[meetthebubus]

Her soft coloring is just luscious. What is she?

The chick? Easter egger I have Easter eggers and buff orpingtons

 

[IamRainey]

No the mama bird. I just want to eat up those soft colors! She's like a butterscotch sundae.

I guess you're saying she's an Orpington. I have 2 Orpingtons but they're lavender and blue splash and look quite different.

 

[meetthebubus]

She's ee as well name is Rambita

 

[IamRainey]

Oh, so pretty! I just love the infinite variations.

Eventually, I want one of ALL of them. ...on my half-acre lot with the 8'x12' run.

 

[Crazy for Chickens!]

Cockerel