From the May 2015 Topographic Data Release, cattle stops have been removed from the Topo50 schema and are no longer maintained. Cattle stops have been a legacy feature for some time.
A ditch covered by spaced bars to allow the passage of vehicles and pedestrians, but not cattle etc
Data Dictionary for cattlestop_pnt: http://apps.linz.govt.nz/topo-data-dictionary/index.aspx?page=class-cattlestop_pnt
This layer is a component of the Topo50 map series. The Topo50 map series provides topographic mapping for the New Zealand mainland, Chatham and New Zealand's offshore islands, at 1:50,000 scale.
Further information on Topo50:
http://www.linz.govt.nz/topography/topo-maps/topo50