The duties of the professor of dairy husbandry provided for in section 172.480 shall be to give instructions in the practical details of the selection, breeding, feeding and management of dairy herds, of the production of milk at the least cost, of the manufacture of butter, the different kinds of cheese, and the marketing of the same, to the farmers of the state by means of public lectures and practical demonstrations throughout the state, through the farmers’ institutes, the public press and the issuing of reports and bulletins on these subjects; also, to give instructions in all these subjects and in creamery management to the students in the agricultural college of the university. It shall be the further duty of the professor of dairy husbandry to make such experiments in the breeding and feeding of dairy cattle, in the handling of milk, and in the manufacture of butter and cheese, at the experiment station, as may be deemed by the dairy interests of the state and that the board of curators may direct.