[SuperLuminal]

She looks at home in the saddle...
However, if the buffalo are freely roaming, what does the "roundup" accomplish?
Cattle were rounded up to be branded or to head for the meat markets...

[Pollard]

“It’s important to vaccinate the herd because we don’t want any sickness really to break out here within our bison, and so they’ll get a bangs vaccination, the females. That’s to help so they don’t get Brucellosis. Brucellosis is a disease that causes females to abort, you know, it infects bison. It can also affect elk,” said Resource Program Manager for Custer State Park Mark Hendrix.

https://www.newscenter1.tv/safety-details-for-the-55th-annual-governors-buffalo-roundup/

[GnuThere]

I think they count, brand the new ones and check general health.
They may harvest a certain percent but not sure it’s during roundup.

I was there last year the week before the roundup - everybody gets really excited about it. Would love to see it sometime.

[Duchess47]

https://custerresorts.com/activities/buffalo-roundup/

“Feel the earth tremble as the hooves of more than 1,300 American buffalo pound through the valley. At the annual Buffalo Roundup, herdsmen on horseback spur them over the ridge, down the hill and into corrals for sorting.

The entire Custer State herd passes by only a few hundred feet from your seat. After they are safely in the corrals, you can watch as the herd is sorted, branded, tested, and treated.”

[Harmless Teddy Bear]

They are branded and sorted.

[ridesthemiles]

I believe they are brought in to winter pastures.

S Dakota blizzards can Paralyse movement—even for the buffalo & cattle.

Snow buries their feed...so they get pampered in the winter months.