Help! Are Plumeria Leaves Poisonous to year old pullets??

[Michelelyl]

We bought a plumeria 'stick' in Hawai'i this March and it has finally started to sprout some leaves! We live in Oregon and it's finally warm enough to put the plant (along with the Meyer's Lemon tree) in the sun during the day....we do still bring them in at night.
I noticed today that the girls ate half of a leaf of the plumeria...is it poisonous to the hens? Should I keep it inside or in the front yard where they can't eat it??
Thanks
Michele