A method, control unit and system for group feeding animals in a herd with different feeding groups based on an estimated energy need, where each respective feeding group has feed having different energy content, and where a control unit identifies an animal in a first feeding group, determines a Body Condition Score (BCS) of the animal, defines a position in lactation cycle of the animal, compares the BCS with a reference value corresponding to the position, and confirms that the animal is able to assimilate the feed and is kept in the correct feeding group when the determined BCS of the animal is within an interval defined by the reference value minus a first margin and the reference value in addition to a second margin.
