592441 Disclosed is a system for electronic identification of a number of animals. The system includes one or more low perceptive impact flexible antennas (11) for detection of transponders associated to each animal, arranged vertically in correspondence of a passage for animals to identify, side by side according to a transversal direction with respect to the passage for animals. The antennas (11) are constituted by a flexible wire (23, 23&rsquo) supporting two cylindrical antennas (25, 25&rsquo) wrapped on cores of ferrite (24, 24&rsquo). The cylindrical antennas (25, 25&rsquo) are arranged in succession on the flexible wire.