Right. Since the generally accepted idea is that fluffies don’t have very good digestive systems that a lot of nutrients aren’t absorbed. Cellulose can be hard to digest for us (oh immortal corn, plus some veggies NEED to be cooked for us to get maximum benefit from), nevermind a fluffy. So, you’ve got all this poop which is really full of undigested material. You can make wonder manure fertilizer, or pasteurize it to make it safe for consumption. Well and hopefully do something about the smell and taste to its more palateable.
I don’t know enough about kombucha, truthfully.
1st generation means the fluffies ate normally, and it is the resulting fecal matter. 2nd generation would be feces resulting from eating a meal supplemented with pre-digested material. You’d keep them separate by timing: feed them normally at night (body can rest and focus on digestion), poop before breakfast (collect 1st generation), breakfast can have 1st generation, poop before lunch (collect 2nd generation), lunch might have 2nd generation, poop before dinner (3rd generation), normal dinner.
OR, you can give younger fluffies, expectant mothers, nursing mothers, etc., whole/normal food, then give the other fluffies 1st and 2nd generation supplemented meals. Or just 1st generation.
Fiber rich foods are cheap, so I think having that in there is a no brainer. What’s the poop like? Dunno. Thing is it gets pastuerized, and after that can get further processed. If its runny or liquidy it can get reduced via evaporation (recycling the water) til its more manageable. If its solid, water can be added for the same reasons.
The big thing is for fermentation there still needs to be sugars present, and that’s not hard for original food or the fecal matter. Its all about pre-digestion, maximizing nutrient availability, and minimizing waste. Arguably the trade-off is you lose the fertilizer potency, but given the volume of poop made? I don’t think its that big a deal. Additionally, letting the poop ferment would generate methane, which could then be used for electricity generation, warming during cold times, harvesting for sale, etc.