Warning: This will be a bit long, as I loved the work I did there and geeked out on it. This dovetailed with my MS research which looked at the vegetation response to supplement/unsupplemented fall sheep grazing. Feeding sheep a high protein source allows them to eat more sagebrush, enough to kill it if stocking density is high enough.
The area in question is a mix of BLM and State (DWR) lands. The area no longer has an annual grazing permit, but grazing has not been retired on that allotment. The area is jointly managed by the BLM and UT DWR, with sage grouse being the focus species. One of the issues facing sage grouse in this area is too much sagebrush; I know that is counter intuitive. But, sage grouse chicks can't use sage brush until they are about 6-8 weeks old, eating mostly seeds and insects until then. Likewise, a reduction in sagebrush increases herbaceous growth; making good nesting and brood rearing habitat. I was meeting with a rancher in the area and noticed that he had tall strips of grass/forbs with sagebrush inbetween where he winters his cattle. Found out those are the result of him feeding hay there late in the winter. That got my wheels turning. I worked with the BLM fuels (fire) staff and the UT DWR and hatched a plan. The rancher would winter some cattle on this piece of ground, feeding hay in areas with tall, rank stands of sagebrush. Before turning out the cattle, the areas where he'd feed the hay would be broadcast seeded with a mix of native grass/forbs. The mechanical action of the cows, plus them eating some of the sagebrush (it's relatively quite nutritious) would kill/reduce the sagebrush. Some of the areas here are full of a non-native grass (crested wheatgrass). The cattle would be removed at the first sign of the native grass species greening up.
More than a few folks were surprised at how well this worked! Even after the first year we had a great response by the vegetation. The BLM/DWR got some habitat work accomplished and it was very cost effective, as the rancher had to pay for the grazing and not a whole lot of paperwork/clearances were needed as it's not considered a ground disturbing practice. It met the rangeland objectives of getting a better mix of grass-sagebrush ratio, met fuels objectives as it reduced long term fuels, met DWR sage grouse objectives by increasing the amount/quality of nesting and brood rearing habitat and the rancher's objectives. The rancher was able to feed less hay than had they been on hayfields. The cattle got their nutrition from the hay/sagebrush and could fill their rumen with dormant grass still standing.