Mont. Code Ann. § 81-4-204
It shall be unlawful for any owner, person, firm, corporation, or association having the management or control of any stallion, ridgeling, unaltered male mule, or jackass over the age of 1 year to permit or suffer such animal to run at large on the open range.
History: En. Sec. 1, Ch. 63, L. 1925; amd. Sec. 1, Ch. 85, L. 1931; re-en. Sec. 3400.1, R.C.M. 1935; R.C.M. 1947, 46-1707(part).