Plants Poisonous to Livestock
USDA: https://www.ars.usda.gov/is/np/poisonousplants/poisonousplants.pdf
PennState: https://extension.psu.edu/plants-toxic-to-horses#section-9
University of Tennessee: https://giles.tennessee.edu/wp-content/uploads/sites/194/2020/10/Ag-Poisonous-Plants-of-the-Southeastern-United-States.pdf
Tri-State Veterinary Services, LLC (CT, NY, MA) https://www.tristatevetservices.com/userfiles/file/toxic-plants-in-ruminants.pdf