Downloadable computer application software for mobile phones, namely, software for livestock monitoring, namely, for gathering, processing and analyzing health data on livestock; Electric or electronic sensors for for identifying and monitoring cattle health; Sensors for scientific use to gather animal biometric data; Electric or electronic sensors for cattle estrus detection and monitoring, namely, dairy herd computerized management systems used to gather and analyze data on cattle, all comprised of a personal computer, computer software and a control unit, for estrus detection, health monitoring, rumination monitoring and for processing and analyzing the collected data; Electric or electronic sensors for cattle estrus and calving detection and monitoring, herd management, health monitoring, and gas emission monitoring; dairy and beef herd computerized management systems comprising a personal computer, recorded computer software, a mobile application, and an electronic control unit for collecting, processing, and analyzing cattle data