Parts of the Shoshone National Forest in northwest Wyoming are now off-limits to domestic goats, which some people use to haul gear into the backcountry.
Forest officials announced the decision for pack goats Monday and say it will remain in effect through 2013.
The purpose is to protect wild bighorn sheep. Forest officials say there is increasing evidence that domestic sheep and goats can spread disease to bighorn sheep.
The Shoshone National Forest is home to one of the largest populations of bighorn sheep in the lower 48 states.
The closure affects the Clarks Fork, Greybull, Wapiti, and Wind River ranger districts. Pack goats are still allowed on the Washakie Ranger District out of Lander.