Virgil's list of the qualities that are desirable in a brood cow corresponds closely to those in Varro's De re rustica and in the texts which, though later, can be plausibly taken as evidence of an existing tradition. Yet, there is one exception, and it is an exception to which the poet carefully draws attention. Varro's, Columella's and Palladius’ ideal cows all share with Virgil's and with each other hairy ears, very long dewlaps and tail, and other features. However, whereas they all have narrow hooves (ungulis breuibus, Palladius), moderate at most (ungulis modicis, Columella), and certainly not broad (pedibus non latis, Varro), Virgil's cow emphatically has big feet (Verg. G. 3.51–9):
forma bouis cui turpe caput, cui plurima ceruix,
et crurum tenus a mento palearia pendent;
tum longo nullus lateri modus: omnia magna,
pes etiam, et camuris hirtae sub cornibus aures. 55
nec mihi displiceat maculis insignis et albo,
aut iuga detrectans interdumque aspera cornu
et faciem tauro propior, quaeque ardua tota
et gradiens ima uerrit uestigia cauda.
for a fierce cow is one which has an ugly head, which has a lot of neck
and whose dewlaps hang from her chin all the way down to her legs;
then let there be no limit to the length of her flank: let everything be big,
even the foot, and hairy ears under in-curving horns,
and I would approve of her being marked with white spots,
either refusing the yoke or sometimes fierce with her horn
and in appearance closer to a bull, and who is lofty in every respect
and when walking sweeps her tracks with the tip of her tail.
Few readers who have sampled the density of Virgil's intertextuality, the
cura with which he selects individual words, or the polyphonic meanings at play in every line of the
Georgics would be tempted to ascribe any such divergence from the technical tradition to carelessness or indifference. However, even if any were inclined to do so elsewhere, the enjambed phrase
pes etiam draws emphatic attention to this dissent: ‘you may, from your familiarity with the tradition, expect the feet to be an exception, but no, they too should be large’. The reader is thus positively invited to look for an explanation.