My girlfriend and I are trying to decide on what breed to get next.  She would like a breed that lays for a long time.  Can you help by letting my know what breed you have had the longest and if they are still laying.  P.S.  We live in Wisconsin, so cold winters....
		
		
	 
I agree with previous poster.
 
To answer your question and offer unsolicited advice:
 
1. New Hampshires, hatchery
2. Speckled Sussex, hatchery
3. Green Egg Layer, hatchery
4. Black Copper Marans, breeder
I have some of these hens laying at three years.
 
Of course, the breeder of the BCMs above is no longer breeding BCMs.  The other birds I got from Cackle and I would buy from Cackle or Ideal or Estes if I had to replace what I've got.  I am not in any way limiting long-term layers to this small group.  There are many other breeds that could lay at three years or more!  This just happens to be what I happen to have right now.  In order of amount of eggs is:  New Hampshire, tie between Speckled Sussex and Green Egg Layer, then the Black Copper Marans comes in last.  (my experience only)
 
Fresh air is particularly helpful to hens.  I read up on ventilation (ammonia issues) when we were trying to build our coop and came across the old version of this:  Open Air Poultry Houses by Prince Tannat Woods.  I believe it's still online somewhere to read.  The old version.  There are also a number of scholarly papers on the issue of ammonia and health of chickens.
 
We live were it gets down below 0F a few times a winter, even this last winter which was mild.
 
For longevity, I think that good feed during the first 5-6 months lays the foundation for continued long-term egg-laying.  Their whole reproductive system is being built at this time.  From conception on through their first egg, their nutrition is critical to making sure their egg laying system is in top form.  The best 
fresh feed available is important.  
Fresh means that all the vitamins haven't gone rancid.  It's very easy for them to be oxidized or lose their potency sitting on the shelf.  Without the proper vitamins, the chicks won't be getting what they need to become great long-term layers.  I also have a tendency to think that high levels of soy in their feed can tamper with their hormones enough to cause issues with their egg-laying apparatus and whether or not they get prolapse or start laying internally (which I've never seen), but you can look soy up on your own if you like as it can become a controversial topic.