IoT-based livestock monitoring has completely changed how farmers handle their livestock. Real-time data on animal health, environmental conditions, and resource management may be gathered and evaluated by utilizing IoT gateway, sensors, and devices. This article examines IoT applications for monitoring livestock and emphasizes the function of IoT gateways in enabling smooth communication. It also analyzes the many IoT communication interfaces that can be used to monitor livestock, and it makes recommendations for the best one for various aspects of a smart farm.