Around 200 mostly fragmentary verses are known, but it is uncertain how long the text originally was, or in which order the preserved fragments should be arranged.
[1] The text opens with a mythological introduction describing the arrival of the spring, which provides the occasio litingadi (cause of quarrel): in the lush pastures an ox and a horse meet and decide to dispute, simply for pleasure's sake.
In the opening salvo (A+25–A+37), Ox claims that, whereas he enjoys the pasture and his calves gambol in it during the spring, Horse gruffly tramples it.
None of the pieces duplicate each other, and they can be identified solely on the basis of the presence of one of the two speech introduction formulae of the series: "Horse answered and spake a word unto the heroic Ox saying" and "Ox answered and spake unto Horse, the expert in war.
Nothing is known about the genesis of the text, but since some hippological lexemes are otherwise attested only in Middle Babylonian documents, the Series was probably composed in the second half of the second millennium BCE.