§ 15. By-laws. The board of directors shall adopt the first by-laws of a cooperative to be adopted following an incorporation, conversion, merger or consolidation. Thereafter the members shall adopt, amend or repeal the by-laws by the affirmative vote of a majority of those members voting thereon at a meeting of the members. The by-laws shall set forth the rights and duties of members and directors and may contain other provisions for the regulation and management of the affairs of the cooperative not inconsistent with this chapter or with its articles of incorporation.