Adding turkeys to laying chicken flock?

I have 16 heritage turkeys.  The area they're going to live in in inside the half acre or so the hens are getting.  They don't really need that much space anyway.  I know about the blackhead risk but I'm pretty sure it's not present in my chickens.  Most likely the turkeys would already be dead by now if it was, and last year's wouldn't have thrived to 34 weeks before slaughtering for Thanksgiving and Christmas dinners.  

I have plenty of electronet fencing so I can segregate them.  What I'm wondering is how much risk there is if I let them commingle. I don't keep roosters, but of the 16 turkeys probably 6-10 are toms.  Not 100% sure yet on the split as they're about 13-14 weeks old now.  Some are clearly toms, some are clearly hens, but there a few I'm not sure about.  Anyway, will the toms try to dominate/mate with the layers?  Not sure if they only will do that with turkey hens, or if they go for anything that will hold still long enough.  Obviously the toms could easily kill a layer chicken doing that.  I'm also concerned about just them picking on the layers and possibly killing or seriously injuring them.  

Is it likely to be ok mixing them (i.e. am I overly concerned), or should I just keep them apart?

I have heard that chickens carry a parasite,  called blackhead, that is deadly to turkeys. I have always been told to keep them apart but know people that raise them together

I've raised chickens and turkeys together. I didn't have any disease transmission issues although the risk can be there with newly introduced birds.

The toms only went after each other for dominance of the turkey flock. They left the chickens alone. One smart tom (narragansette) spent his energy puffing up and displaying for the ladies while the other toms fought, which was pretty brutal and not something I'd ever seen before. I had to separate them or they would have torn each other up. So you may have to separate the toms from each other, but I never saw them notice a chicken one way or another.

Robin Katz wrote:I've raised chickens and turkeys together. I didn't have any disease transmission issues although the risk can be there with newly introduced birds.

The toms only went after each other for dominance of the turkey flock. They left the chickens alone. One smart tom (narragansette) spent his energy puffing up and displaying for the ladies while the other toms fought, which was pretty brutal and not something I'd ever seen before. I had to separate them or they would have torn each other up. So you may have to separate the toms from each other, but I never saw them notice a chicken one way or another.

When the hens get out of their area (fence is really temporary and definitely not chicken tight) and come near the turkeys they will all band together to guard their area from the hens.  

Eventually we'll reduce the turkey flock down to 1 tom and maybe 3 hens.  I've got someone interested in 2 hens for holiday meals, and my boss wants a couple, probably toms, for the same purpose.  The remaining "excess" turkeys will be processed as needed when we decide we want to eat one (breed the best, eat the rest, right).  I'll probably target the toms whenever there are too many for the number of hens to reduce the infighting.

I've got 5 commercial turkey hens and a trio of heritage turkeys; they're all about 12 weeks.  I hatched the heritage turkeys and bought the commercial girls at 10 days old.  I brooded them together with ducklings, layer chicks, quail and a guinea hen.  One of the three heritage turkeys is a male.  He started displaying on his second day out of the egg and really liked it when I introduced the commercial girls.  

From the indoor brooder they all went to an outdoor brooder and then got split up; turkeys and ducklings in one area and laying hens, layer chicks and meat birds in another pen.  The turkeys basically go wherever they want.  I don't know if the commercial girls can fly anymore as they're about 15-20lbs, but they can get up on the coop and jump out.  The heritage turks will spend time on my roof.  The turkeys will routinely get into the chicken area just to hang out.  My layers (and the layer chicks now too) scoff at the fences and they'll wander and spend time in the duck pen.  The adult layers are happy to bully the turkeys.

A couple of days ago I saw the tom chase a laying hen briefly.  There wasn't any attempt to mate and I think he was just sticking up for himself.  He's definitely interested in the turkey hens as he's been displaying more and more frequently of late.  I really haven't had any concerns on that front yet, but a 25lb tom could be a menace.  

This is my first time raising turkeys and I love them.  I've found them to be very sweet and gentle although they still can't discern scratch grain from fingers.

Edit:  Just wanted to add that my broody hen hatched out 10 chicks about 3 weeks ago.  They roam the most but spend a lot of time with the ducks and turkeys and she goes into one of their coops at night, not one of the chicken coops.  The roos are mating with her but the tom doesn't bother her at all.