Edited - this has become one of my "mini - books" and is long!
I'm not sure that it would work in your situation with an already in place, solid floor. Well, not true either - there are others here who say it does work...
In my situation(s) - all horse stalls, feed pens and chicken coops have been directly on the ground. One of the things we did with stalls that horses "tried to dig to china" - was re-level & pack them with clay and sand rather than straight sand and spent lots of time doing that on a regular basis. Over the years, we've had quite a number of ponies and horses who seem to like standing with their withers 3' below their rumps! & I've also had several full size horses that loved digging in corners or the back, forming a pile in the center/towards the front of the stall and you'd walk into the barn in the AM with the horse's head hanging over the top of a 7' stall door! I have actually had a pony sized arabian (full sized stall in trainer's barn) and a shetland pony (one mat at feed bucket) dig holes into the stall mats (mats were new in both cases)- that then had to be replaced, LOL. You can see quite a bit of our feed set up below, though not all of it. These ponies were not kept in those pens, in fact, when not feeding the pens were kept closed so no one fought and cornered another (there is a full size horse and a 1/2 Arab/Shet sharing the pasture with the two Shetland mares below). The two pictured, were not the only diggers in that time frame - I often threw "trash" into the holes and the ponies learned to step into their holes with tires, cardboard boxes, small water bottles, larger 2ltr bottles and shredded paper or pieces of tarps....
View attachment 2283808
Now, I have chicken coops and pens directly on the ground that have similar sand to the above. The link below shows the different materials that we (mostly me) have used to do the DLM. But our coops are not on mats and stone dust base. They are also all predominantly open air - meaning they don't have solid sides, back or fronts. They have worked for us well over the 5-1/2 years we've been doing this now...
DLM
As to smell - even in an open air type coop, there can be smell. If I suddenly get "scent" that is strong, then I know I have to add more material of some kind - it works best to add different types & sizes - not all the same. Personally, chickens themselves have their own scent, just as horses/cats/dogs & other livestock do. Our open air coops sometimes get rain directly in them (storms have removed both tin properly attached to a roof and tarps over a hooped coop). Because of first the ground we are on and then as I've built up DLM, they have drained relatively fast and actually not been "stinky". Not sure if that would be the case in an enclosed chicken coop which, to me, would already have a "smell" of "chicken".
I don't know where you are located.
I have been in a LOT of barns here in NC (and now coops). They have almost all been built like typical horse/livestock barns. Even almost new, just occupied for a few months or having had great applications of stall mats - they STINK of horse, manure, urine and ammonia (and after hurricanes - of NASTY, wet sand - even in areas where the stalls were on a good stone/limestone base). I have had to excuse myself and walk out of quite a few. More than a few times, I've been violently ill after exiting a "smelly barn" and I'm not as sensitive to smells as most people I know. I have wondered since 1993 why North Carolinians refuse to build open air barns like they build in Arizona, California and Florida (Georgia?).
DLM is talked about a lot here on BYC. It is also talked about in depth on a lot of permaculture/homesteading websites and YouTube videos.
"Back in the day" - pioneer times in mid-west or western states - DLM was done with other livestock, too, not just chickens. It is a method where clean bedding (usually straw, but could be prairie grass or now even shavings or shredded paper) was layered on over the dirty bedding, manure & urine. Deep enough that you couldn't see the wet or dirty. It saved time in the winter for farmers who had plenty to do and a short amount of daylight. Then in the spring, the barns were cleaned out, all of the DLM (wasn't called that then) was hauled and spread out on fields OR put into a compost pile to finish composting (would have already started in the barns). This also worked to keep the barn(s) a bit warmer during the winter cold - especially since straw was often stacked or spread up the walls. Honestly, from 2009 to 2014, I was up in OH in Amish country a lot. I went into quite a number of barns that used a good system of "DLM" in their livestock barns (cows, pigs & horses) and their barns - not cleaned all winter - were cleaner smelling than most barns cleaned on a daily basis down here in NC. I was also in barns that didn't have a good DLM type system OR just needed more bedding in a more timely matter. They were BAD smelling and your throat closed and your eyes stung/watered. I also saw these methods used on two different Hutterite colonies in MT from 1995 thru 1997. It's pretty amazing!
Now I'm watching YouTube videos where this is being done, on the ground, not only with chickens but pigs kept in areas that the land owner wants good compost to be piled up to be utilized later. Same thing.
Sorry - back to you. If you are going to do it on mats - get some good garden dirt/compost (not store bought bags, but real stuff w/ the bugs, worms, bio-nutrients already working) to put in your stalls, too. A shovel full or so?? That will help the bedding/DLM to get started and keep going. When you clean it out, you don't remove all of it. If we have a dry spell (a lot), I will dump the water out from waterers or even bring a hose and hose it down a bit (did/do that on hot, dusty/enclosed horse stalls as well). You don't want hanging dust particles & do want the bedding to be a little moist in the bottom layer.
- bedding materials - different sizes & types - very important to allow moisture/air wicking.
- deep - from 6 -18" to start. If doing a true DLM on mats, it should still work (I think?).
- you don't have to clean or turn - usually - a bit of chicken feed or treats literally tossed into area needing turning - they will do the work.
- some moisture, but not really wet or wet on top. Certainly shouldn't need to wet it every day in most climates
Turkeys - I have no idea if this would work or not IF they are by themselves. If in with chickens, then I would expect it to work fine as the chickens would turn it for you. I only have experience w/ "stupid" commercially raised turkeys that DO NOT dig or seem to scratch at all. If your turkeys show an interest in scratching (the element that turns the manure under/into your DLM), then it should work the same as chickens.