What farm animal out eats a cow by seven to one?

Answer 1

Unless you are thinking of an elephant as a "farm animal" that would obviously eat 7 times more than a cow, technically an elephant isn't really considered a farm animal. Now I am going to go according to Animal Units (AU) on consumption to make things easier here. One animal unit is equivalent to a 1000 lb (454 kg) cow with or without a calf. A farm animal that eats twice as much as a 1 000 lb cow is a 2 000 lb bull, which typically has an AU of 2.0. A Chianina bull, the largest that tipped the scales at over 3500 lbs and the largest breed in the world, would have an AU of 3.5, which is thrice and a half times that of a 1000 lb cow. Going in AUMs or Animal Unit Months (defined as the amount an animal unit can consume in one month's time [780 lbs (355 kg)]), a 2000 lb bull eats twice as much as a cow that has 1 AUM can eat 1560 lbs in one month (2 AUM = 1560 lbs). The Chianina bull example can eat 2730 lbs in one month (3.5 AUM = 2730 lbs).

As for horses, most horses have an AU of 1.5. The large draft breeds such as the Percherons, may have an AU that exceeds 3.0. However, thrice as much as a cow is the highest that a farm animal will eat.

So the final answer to this question is that, technically, there is no such animal that exists.