Abstract: In rows of mink cages in mink farms it is characteristic that the animals relieve nature in the same end of the cages in which the animals' drinking valves are mounted, and the surplus water from the drinking valves, therefore, gets mixed with the manure, whereby the required manure tanks have to be much larger than necessary for the mere collection of the manure. According to the invention the drinking valves (4) are designed so as to produce a minimum of surplus water, but it is an associated risk that the valves may then fail to function in case of even quite small foreign bodies occurring in the watering water.

Abstract: A feeding bottle (2) having a bottom cap (8) comprising an inverted cup shaped portion (10), which projects into the bottle and is surrounded by a stretched, resilient rubber sleeve (12) covering a radial hole (14) in the cylindric wall of the cup portion (10) to form an automatic air intake valve. The radial hole (14) is provided in a part-cylindric facet (16) of reduced cross section curvature, whereby even a gross rubber sleeve (12) is easily liftable from the hole (14) for sensitively admitting air into the bottle (2) whenever a moderate suction vacuum is built up therein.