It shall be unlawful for any person, company or corporation to sell or offer for sale, barter or give away any livestock feed material which is infested with seeds of noxious weeds unless such feed material shall first have been processed and the viability of all noxious weed seeds present therein destroyed, except such feeds (1) may be sold for consumption on the same farm where grown or (2) may be sold to commercial processors or commercial feed mixers.