Also just to add on, it won't do them harm if you overdose them but don't go crazy. Best way is to do it in the feed mix with 4 tablespoons of vegetable oil and add to the feed and then let them eat it that way.
I know this is late but thought I'd add it to this thread. When using beryl's friendly prebiotic you have to administer it to the chickens straight away as it is a live prebiotic, so you couldn't give it the next day, its best to give it to them as soon as possible as all the love bacteria will...
