Fuente: WIPO "milk" A metering apparatus comprises a pipe (10) through which milk is fed from a farm vat (11) to a tanker mounted collection vessel (12). In the pipe (10) is arranged a meter (13), for example a turbine flow meter for metering the milk. Valves (V2, V3) are arranged downstream and upstream of the meter (13) respectively. Upstream of the valve (V3) there is arranged a reservoir vessel (14) into which is passed milk from the vat (11) by means of a hose (15). A venting pipe (16) leads, via a valve (V1) from the top region of the reservoir vessel (14) to the storage vessel (12) above an inlet (18) to the vessel (12). The apparatus and method of operation is such that the meter (13) meters only milk, and not air, the valves being controllable in response to probes (P1 to P4) to prevent milk with entrained air from being metered.