In Australia when a forage crop is close to maturity, producers apply a dilute application of Roundup to "freeze" the crop to retain protein quality. They then turn the sheep in to graze. Once the crop is harvested, the animals are moved to a different pasture, and the crop grows back. Gary says the Roundup makes the plants "sick," but does not kill them.
–Tracie Roeder, "Where is Boddington, Western Australia?" Targhee Talk: The Newsletter of the U.S. Targhee Sheep Association, Vol 11 No. 3, July, 2011, p. 5