Purina Mills, LLC is the farm animal feeds unit of Land O' Lakes.

[5] The checkerboard trademark, intended to make their burlap bags of feed stand out from competitors, was introduced in 1904.

At one point, Ralston Purina owned an interest in the St. Louis Blues National Hockey League team; during this period, the arena they then used was referred to as the "Checkerdome".

The checkerboard logo then evolved into a personal development concept Danforth put forth in his book I Dare You, in which he proposed that four key components in life ("Physical," "Mental," "Social," and "Religious") need to be in balance, and one area was not to develop at expense of the other.

[7] The concept became intertwined with the company in 1921, when it began selling feed that was pressed in cubes called "checkers".