grown bovine on its upper side the rectangular base frame 42 mounts vertically extending transverse u shaped arched tubular crossbars 43 the parallel legs of the crossbars 43 extend downwardly from the central upper horizontal section where they are welded to the base frame 42 these four vertically extending crossbars 43 are parallel to the short transverse sides of the base frame 42 and equispaced along the length of the base frame 42 one crossbar 43 is located at each end of the base frame 42 an entry gate half 45 consists of a vertical tube having multiple vertical equispaced coplanar horizontal tubular stubs attached one side the vertical tube of an entry gate half 45 is larger than the vertical leg of an arcuate crossbar 43 an antisymmetric pair of entry gate halves 45 are pivotably mounted on opposite sides of the arcuate crossbar 43 at the entry end of the roping chute 40 the exit gate halves 46 are identical to the entry gate halves 45 and are pivotably mounted antisymmetrically on the opposite sides of the arcuate crossbar 43 at the exit end of the roping chute 40 the two nonreturn gate halves 47 are structurally similar to the entry 45 and exit 46 gate halves but have only a single horizontal tubular stub at midlength a nonreturn gate half 47 is antisymmetrically pivotably mounted concentric with each vertical tube 58 the nonreturn gate halves 47 are spring biased to close and to let an animal pass into the roping chute 40 but are prevented by travel stops from opening to let an animal exit through the entry end of the roping chute 40 the entry 45 and exit gate 46 halves are operated.