A milk analyzing system is disclosed, which includes a milk constituent analyzing unit configured to analyze milk from a milking station with respect to a specific constituent of the milk, and a control device communicatively connected to the milking station and to the milk constituent analyzing unit. The control device is configured to retrieve an analyzing appropriateness parameter for each of the animals milked by the milking station indicating an appropriateness of analyzing milk from the animal with respect to the specific constituent. The control device is configured to control the milk constituent analyzing unit to analyze milk from the milking station with respect to the specific constituent when the time elapsed from when the milk constituent analyzing unit last analyzed milk exceeds a threshold time period, irrespective of the analyzing appropriateness parameter for the animal milked by the milking station.

A milking arrangement comprising a milking machine for milking an animal, wherein the milking arrangement comprises a control unit that is configured to obtain identity of the animal in connection with milking of the animal, obtain a reference point in time of a lactation cycle of the identified animal, determine to take at least one milk sample of the animal, when a predetermined time period has passed from the reference point in time; obtain a Haptoglobin level from the milk sample, compare the obtained Haptoglobin level with a Haptoglobin reference limit, and indicate health condition of the animal, based on the made comparison.

A method of calibrating a sensors in a system for obtaining animal data from animals is described. The sensors are configured to obtain measurements of an animal related parameter during arbitrary visits by the animal to the sensors. For at least one of the animals, a first measurement associated with a first sensor of the sensors is obtained, and calculating one or more relations between the first measurement and one or more second measurements associated with the respective animal. Each of the second measurements is obtained using a further sensor, so as to obtain at least one representative relation for each combination of the first sensor and each one of the further sensors. The system calculates, based on the at least one representative relation, a correction factor associated with at least one sensor of the plurality of sensors.