They may not eat it but they pick through it looking for something. When I clean the poop out of the nesting boxes they run over to pick through it.Never seen my chickens eat poop. I have seen them accidentally peck some then shake their heads in disgust Hahaa
Wishing, you asked about the leaves drying. Yes you can put them in the oven but theres something much easier. The MICROWAVE ! Sandwich them between some paper towels , set a plate on top then add a bowl of water for safety. 30 seconds then 15 sec. at a time checking them . However , that didnt work fast enough to suit me so I skipped the water and they dried completely in two 30 second intervals
Only add leaves that have browned and fell off the tree according to one site because green leaves will change your water parameters too much. Dried leaves will lower PH , add antimicrobial and antibacterial property to your water and creates a biofilm that shrimp love to eat and fish like to spawn in.
So fun little experiment there. they said they should sink in 24 hrs.Alder cones, catalpa AKA Indian almond, oak and magnolia leaves are all safe to my knowledge . It goes w/o saying I hope " Dont use poison oak . LOLOL