Boyd’s Bible Dictionary:

Straw used for cattle fodder and litter
(Gen. 24:25; 1 Kings 4:28; Isa. 11:7; 65:25); in making bricks (Ex. 5:7,16).

Concise Bible Dictionary:

This is spoken of as being eaten by the cattle, and it is foretold that it will be the food even of the lion in a future day. This agrees with the practice in the East where the straw is cut up or crushed, and used as food for cattle (1 Kings 4:28; Isa. 11:7). It was used in Egypt for mixing with the clay in making bricks: in some of the ancient Egyptian bricks the straw can be seen.