I ordered and either spread or composted 1000's of tons each year From 2011 to 2019. Broiler house clean out was trucked from 50 to 90 miles to our site and we stockpiled there between clean outs so we had a constant supply. The site was 5 acres out of a 100 acre row crop field surrounded by 1000's of acres of pine stands and hardwood hollows. We had deer on the site every night. They damaged our tarps and covers constantly. The turkeys often bugged the native grasses surrounding the site. There are 4 farms that started a soil improvement program between 2011 and 2013 that ran thru 2019 that I am still involved with in Trigg county KY and Stewart county TN both have seen constant and sustained increases in turkey populations to the point that believe are near a healthy capacity. We have seen large improvements in habitat but a reduction in trapping of predators. I see no signs of disease from applied fresh, aged or composted litter on thes properties. I won't deny that it happens there can be great variations in barn cleanliness affecting bacteria development but I will add that massive habitat improvements and never over harvesting or taking of hens seem to be a factor. Three of my most productive setup areas during the last 10 years are all within 1/8 mile of where we stocked litter.
On a side note the only issue we found was the bedding growers used (rice hulls and cleanings) contained seeds of pig weed, amaranth, Palmer, water hemp and other hard to manage weeds. The fresh (not composted) litter would spread these. Even after being warned a lot of planters wanted the nitrogen content so they spread it anyway.
