Section 26B. No person shall buy, sell or transport within or import into the commonwealth hatching eggs, baby chicks or live poultry, except poultry intended for immediate slaughter or for exhibition subject to permit granted by the state department of agriculture, unless such hatching eggs are the produce of flocks which meet, and such baby chicks or live poultry meet or are the first generation progeny of flocks which meet, the minimum requirements for ”pullorum passed” or ”pullorum clean” grades of poultry, as established by the commissioner of agriculture, or the equivalent thereof. Whoever, himself or by his servant or agent, violates any provision of this section shall be punished for the first offence by a fine of not more than one hundred dollars, and for a subsequent offence by a fine of not less than fifty nor more than two hundred dollars.