A milking parlour and a method includes a rotary platform, plurality of milking stalls arranged on the rotary platform, a common milk line conducting milk from several milking stalls to a common milk tank, a local milk receiver for each milking stall and a valve member controlling the milk flow from the local milk receiver to the common milk line. The valve members are controlled such that all milk of acceptable quality from the local milk receiver is discharged, via the common milk line, to the common milk tank before milk of unacceptable quality is discharged from the local milk receivers to the common milk line during a milking period in the milking parlour between two following washing processes of the common milk line.
