the invention relates to a system for monitoring the reproductive activity of animals where a male mounts a female in order to mate , this system can determine the following information each time a male mounts a female , namely : whether or not the male has ejaculated , the date and time of ejaculation , and the identification of the female mounted . the system comprises an electronic sensor device placed on male animals , a radio - frequency identification tag placed on female animals , a system for preventing multiple or erroneous readings , and an electronic hand - held device for collecting information and configuring devices . the invention also includes a communication system and a central system that manages and concentrates all of the information , allowing the user to access said information in an organised , centralized and systematic manner .