The Collaborative International Dictionary of English v.0.48:

Laystall \Lay"stall`\, n.
   1. A place where rubbish, dung, etc., are laid or deposited.
      [Obs.] --B. Jonson.
      [1913 Webster]

            Smithfield was a laystall of all ordure and filth.
                                                  --Bacon.
      [1913 Webster]

   2. A place where milch cows are kept, or cattle on the way to
      market are lodged. [Obs.]
      [1913 Webster]