Whoever, by himself or his agents, kills, for the purpose of sale, any calf less than four weeks old, or sells, or has in his possession with the intent to sell, the meat of any calf which he knows to have been killed when less than four weeks old, shall be guilty of a misdemeanor, and, upon conviction thereof, shall be fined not less than five nor more than $15, or imprisoned not more than sixty days, or both.