thanks Moco27 for posting this. I'm fascinated by this whole thing. I do believe that the micro biome does not get enough attention. what I started out thinking I needed to do and how I think about it now are radically different. the very best litter I've found so far came from a pile of wood chips that had been sitting and breaking down for more than a year, to the point where it had significantly decayed, even turned to dirt in places. I've grown out several batches of CX on this and had great success. I've used some of it with my egg layers as well. with the CX, I needed to remove the mats of droppings regularly given the sheer volume of it but with my layer hens, about the only reason I dig out my coop is because the floor gets to high. it all goes into the composter and out comes amazing fertilizer for my fruit trees and garden.
now what I really wish I had was some kind of macerator that i could mix "fodder" in and pre-compost it, to get the "pro-biotics" going, along with all the worms and other bugs the hens will love.
I feel like I have embarked on a path of experimenting that will have me going for a while, trying to find the best balance for what is good for my hens, but also good for my garden and low maintenance. I'm fairly convinced that the type of wood that the chips are made from makes a big difference. in this last batch, I tried to get only hard wood chips, no pine.