Wheat straw hay is a valuable agricultural byproduct obtained from cereal plants such as barley, oats, rice, rye, and wheat. After the grain and chaff have been removed, the dry stalks form straw, which makes up around half of the yield of these cereal crops. This versatile material serves various purposes, including as fuel, livestock bedding, fodder, thatching, and even basket making.

In the context of animal nutrition, hay is commonly used as feed for large grazing animals raised as livestock, such as cattle, horses, donkeys, goats, and sheep. However, it is also suitable for smaller domesticated animals like rabbits and guinea pigs.