The Collaborative International Dictionary of English v.0.48:

Rother \Roth"er\, a. [AS. hry[eth]er; cf. D. rund.] (Zool.)
   Bovine. -- n. A bovine beast. [Obs.] --Shak.
   [1913 Webster]

   Rother beasts, cattle of the bovine genus; black cattle.
      [Obs.] --Golding.

   Rother soil, the dung of rother beasts.
      [1913 Webster]