and welcome to the thread. As you have time, you may want to go back and peruse as there's a WEALTH of info in all those pages. Anyway, for a shortcut, please check out:
https://tikktok.wordpress.com/2014/04/13/fermented-feed-faq/
I make my FF in a 5 gallon bucket. I have ~35 adult LF birds of 5 breeds (none are meaties, all are dual purpose) I use approximately 1/2 of the bucket each morning placed in 4 troughs set up in 4 separate enclosures. Most days they finish it all by late afternoon. Some days they don't. If there's still some ff in the trough the next morning, I put less in so it has basically the same amount to start the day each day. Every flock is different and much depends on time of yr, weather, location, bird breed, age, etc.etc. The variables are numerous. Some days they have the trough picked sparkling clean by early afternoon, in which case I often bring them additional FF or some other snack late in the day to hold them overnight.
I recommend you start out feeding them what you think they should have and watch to see how much they consume and how quickly. If they wipe it out immediately, you aren't giving them enough. If there's much left, then you're giving them too much. You will then have to adjust daily as you observe the dynamics of the flock.
IMHO, birds in a tractor will wipe out the earth beneath them within an hour of being moved. After that time there's very little left for them. Obviously the more often they are moved, the better it is for the birds. They can't really "forage" in a tractor (unless it's a really huge tractor). Maybe you could free range them instead of tractors? That would give them better access to the worms as well as better exercise (to keep them active).
best o' luck to you!
