We have this invasive vine along what used to be a fence. The vine is fairly woody, round stemmed, with stickers. Stickers come out fairly straight (i.e. no curve), and are triangular. Leaves are large and more or less round, and they alternate on the vine. Please identify and give any information on eradication. Also advise if there is any known harm to livestock, particularly dairy cows. Thank you as always
Harford County Maryland vine
This is Greenbriar.
Here is a page about it: https://extension.umd.edu/hgic/greenbrier