A newspaper account I found said steamboats passing through Bismarck in 1881 carried 1,800 head of horses and cattle and 600 sheep.
The Bismarck Tribune, on Sept. 1, 1882, reported, “The Coteaus are admirably fit for stock raising. Sheep do particularly well. The effect of the climate is to make fleeces heavier.”
In March of that same year, the Jamestown Weekly Alert reported, “A party of Philadelphia capitalists are contemplating sheep farming on a large scale in Dakota.”