Missouri Revised Statutes Title XVII. Agriculture and Animals § 270.250. Bulls, rams and boars may be castrated, when

If any bull or ram over one year old, or boar hog over three months old, shall be found going at large off the premises of or out of the enclosure or control of its owner or keeper, after three days' notice, signed by three residents of the township where such bull or ram or boar hog may be running at large, and the owner shall fail or neglect to take up or confine the same on or within his premises, it shall be lawful for any person to castrate any such bull or ram or boar hog, except that the same be done in the usual manner of castrating such animals, and so as to endanger the life of such as little as possible; and the person castrating any such bull or ram or boar hog, shall not be liable for any damage on account thereof; provided, that such male animal may be taken up and confined at once, by any person finding same at large, and where the owner is not known at the time, it shall be lawful for any person to take up such male and keep same in confinement for three days; and if such male is not reclaimed by owner during that time, and pay therefor to taker-up the sum of one dollar, then it shall be lawful to castrate such animal as if notice had been given.