That licorice smell is the anise that is in it. Good Stuff. The calf-manna is not just for calfs. It can be fed to most all the farm animals but not sheep because of the supplemental copper in it.
It been some time ago when a state vet told me that. I beleve he said it was do to iron toxicity (iron oxide, ferrous carbonate, ferrous sulfate are all a source of iron).. Im not saying that Calf Mana is bad.. Im saying to much of it is a bad thing for chickens..
Now with that said I use it on my goats (milkers and kids), Steers, rabbits, and yes on my chickens (over 6 months) and at the rate of 5% of daily ration...