[wobbleblob]

I don't know about the 'mainly' part. North of the Alps, the grass only grows in the summer, south of the Alps, it only grows in spring and fall. If their cows fed only or mainly on grass, dairy pastures could only support small herds, and dairy would be a very expensive luxury item.

[mikaelgyth]

They usually harvest and conserve grass for use in the seasons when it doesn't grow.

[Dewie3]

http://upload.wikimedia.org/wikipedia/commons/d/d2/Hay_bales...

[digi_owl]

As one overly creative tourist guide supposedly put it, marshmallows for trolls.

[arstoienarston]

We usually call them tractor eggs.

[Dewie3]

I've never heard that nickname before today.