it took me a while to embrace the bio-active approach, but @doublenerds has a very good approach, IMHO. giving the hens something to sort through and discover, acts as a great fascinator for them. just keep adding more in, then rake/shovel it out every 3-6 months and you will have wonderful compost with a healthy micro-biome, a pro-biotic system that is good for the chickens and great for the garden.