Milking system with detection system

A milking system, comprising a milking device for milking milk from a dairy animal, a milk line in fluid connection with the milking device, and a sampling and analysis device arranged to take a sample of the milk from the milk line and to analyse milk from the sample, wherein the sampling and analysis device comprises:

• a control unit for controlling the sampling and analysis device;
• a carrier comprising a base material with provided thereon one or more reagent pads, that are arranged to provide a detectable response in the presence of at least one substance in the sample;
• a dosing device arranged to provide, under the control of the control unit, a part of the sample onto one of the reagent pads;
• and
• an optical sensor device arranged to detect optical radiation from said reagent pad supplied with said part of the sample, and to analyse the detected optical radiation to provide an indication of a presence or concentration of said at least one substance,
• wherein the dosing device comprises:
• a nozzle with a supply line for supplying a portion of the milk sample to the nozzle, the nozzle being arranged for supplying the part of the sample to the reagent pad;
• a pump controlled by the control unit and arranged for pumping liquid through the supply line towards the nozzle;
• a flat wall part;
• and
• a mover arranged to press the flat wall part and the nozzle against each other to thereby close the nozzle.