The director shall periodically issue and circulate among the farmers and livestock raisers of Texas printed bulletins showing the results of the experiments and the results accomplished and the progress made in the improvement of the agricultural and livestock interests of this state. The bulletins shall be mailed to all persons who desire them. The director shall invite the cooperation of persons engaged in those industries and shall give them advice when requested with reference to the management and cultivation of their farms and the care, management, and feeding of their stock.