Straw

No, they can’t as straw has no nutrients and is not a food source. They need to eat hay.
 
Whilst it kind of looks the same, hay is grass (of different varieties) and so is a leaf full of sugar and nutrients that is dried. Straw is the stem of wheat/barley etc and so is the mechanism that the nutrients use to get to the leafy parts and so doesn't have much by way of its own nutrition.
 
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