A mink farming plant (1) comprises a row (2b) of mutually spaced (5) mink cages (3), each having a bottom wall (21), wire-mesh side walls (22,23) and a front wall (11), to which a nest box (4) is attached with a nest box rear wall (13) with a nest box opening (12). The plant further comprises a drinking water line (10) running along the row of cages, said line being part of a drinking water system. In the cages, a drinking valve (16) is arranged on a side wall (22), said drinking valve further comprising a downward-facing outlet and in connection therewith a downward-facing protruding activating pin, and which is connected to the drinking water line (10). The valve is configured for supplying water by a light touch or force applied on the activating pin, at least in the form of a drop of water. The activating pin is positioned 3-5 cm above the bottom wall of the cage and no more than 15 cm from the nearest edge of the nest box opening.