What's your opinion of cultured buttermilk? My does are dry now but often, when I'm feeling lazy, I mix Layina, fish meal and enough goat-buttermilk to make a very dry mash. The chickens love it. I sometimes use whey as a substitution.
Cultured buttermilk is great! I use it sometimes but the yogurt I get (Mountain High) has 5 varieties of probiotics. It's nice and thick and easy to spoon out.
I have been looking at BSF for a while now. I don't know if they live where I do though as I have never seen one. I try to examine every small fly or bee that I see to see if it is a BSF.I'm a cheese maker, I milk both sheep and cattle (no longer commercially thank goodness) but do not feed a lot of whey or curds or yogurt to the poultry since we have very little go to waste here - what I make is for human consumption. I do tend to feed buttermilk in the spring during butter making season. However, a few things... There is never any added sugar in any yogurts or cheese I make - ever. I can't imagine ever even needing to add sugar. Second, keep in mind that excess calcium is great for laying hens but bad for growing chicks. This is why I feed BSF to the adults only. Yes it's great animal protein, but it's way too high in calcium for the babies. The babies tend to get fish meal and sometimes liver but never BSF or dairy. That said... I couldn't feed the number of adult poultry I have and assure a complete balanced ration without raising BSF too. I grind and ferment my grains but the BSF balance that ration out for me and assure they get the animal protein poultry require. I encourage everyone to raise BSF because it's so easy and of course free. I tend to run out of BSF if we have a late spring but that is when I make all my butter for the year, so a lot of the buttermilk goes to the adults on the spring before heavy BSF crawl off begins and before bugs are prolific.