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Didn't read the other posts, maybe its been said but...
Constantly adding carbon material will neutralize the smell. What do you use as bedding? Wood chips are a good idea and can often be obtained for free... try calling a tree/stump grinding company to see if they offer this service. They typically will do drop-off but if this doesn't work for your area, you could always ask to do pick-up. I also have straw I add to this, to give them something to nestle in if they want to. That's for the coop... I did notice someone put a pic of a portable chicken tractor on here, which is ideal for sure. No need for bedding! But yeah... in a coop setting, just add carbon -- wood chips, straw, wood shavings, dry leaves (I don't think I'd make this my main one), etc.
Edit to add: To elaborate... its better if they're kept on dirt and then this bedding is added. That way it becomes an active compost. You add a layer each time you start to smell, or just before ideally.. keep adding as needed. If you use them for meat, in between batches mix it up and add more fresh carbon material on top. If the coop gets a good amount of sunlight, you could water it down a bit before adding the fresh dry stuff on top to make a true compost situation, but I do not do this because the stall I keep them in stays very dark... I wouldn't trust it to keep bacteria down without the cleaning/sanitizing quality of the sunlight. Also, I get enough water on my property so it soaks from underneath, and I keep enough dry straw/woodchips on top to keep the birds from the wetness. Only the buggies and stuff go down there, making it a compost. When it builds up too high, you just shovel it out and start again. This also has an added benefit of being warm for the birds (compost naturally heats) and houses lots of yummy bugs for them. If your coop isn't on the ground/soil, I still think it will keep the smell down but may not have the other benefits. I would suggest in such a situation to clean it out only as often as needed (when its piled too high) and then add the carbon/poo mix to the compost pile so it composts fully.