An animal handling arrangement comprising a herd management system and an arrangement for determining a gut fill level of the rumen of an animal operatively connected to the herd management system, wherein said arrangement for determining a gut fill level - comprises a three-dimensional camera arranged to be directed towards the animal and for recording at least one three-dimensional image of the animal or portion thereof; and an image processing device connected to the three-dimensional camera for automatically analyzing the three-dimensional image and determining the gut fill level of the rumen of the animal based on the analyzed three-dimensional image; and - is arranged to automatically supply the herd management system with the determined gut fill level of the rumen of the animal, wherein - the herd management system is arranged to automatically initiate an animal related action based on the determined gut fill level, characterized in that - the three-dimensional camera is located in a station, wherein the animal is forced to essentially stand still during the recording of the at least one three-dimensional image of the animal or portion thereof, - the three-dimensional camera is located on the left side of the animal at a height above the rumen triangle of the animal, and longitudinally in essence in level with the rumen triangle of the animal, and is directed downwards towards the rumen triangle of the animal in said station during the image recording to give image information from there; and - the image processing system is arranged to automatically determine a depth and/or volume of a convexity or concavity of the rumen triangle, and to determine the gut fill level of the rumen of the animal based on the determined depth and/or volume of the convexity or concavity of the rumen triangle. - comprises a three-dimensional camera arranged to be directed towards the animal and for recording at least one three-dimensional image of the animal or portion thereof; and an image processing device connected to the three-dimensional camera for automatically analyzing the three-dimensional image and determining the gut fill level of the rumen of the animal based on the analyzed three-dimensional image; and - is arranged to automatically supply the herd management system with the determined gut fill level of the rumen of the animal, wherein - the herd management system is arranged to automatically initiate an animal related action based on the determined gut fill level, characterized in that - the three-dimensional camera is located in a station, wherein the animal is forced to essentially stand still during the recording of the at least one three-dimensional image of the animal or portion thereof, - the three-dimensional camera is located on the left side of the animal at a height above the rumen triangle of the animal, and longitudinally in essence in level with the rumen triangle of the animal, and is directed downwards towards the rumen triangle of the animal in said station during the image recording to give image information from there; and - the image processing system is arranged to automatically determine a depth and/or volume of a convexity or concavity of the rumen triangle, and to determine the gut fill level of the rumen of the animal based on the determined depth and/or volume of the convexity or concavity of the rumen triangle.