This chapter aims to bridge two emerging fields for smart reproductive management and nanotechnology, poised to play an important role in animal production. Nanotechnology offers significant potential for enhancing animal health, reproduction, and livestock management. Nanotechnology has become an important tool in advancing assisted reproductive technologies (ART), nano-nutrient delivery, pathogen detection, biosensing, and health management in farm animals. Nanoscale nutrient delivery systems provide improved bioavailability, targeted release, and reduced toxicity. At the same time, nano-minerals, such as nano-selenium and nano-zinc, contribute to enhanced reproductive performance, immune function, and product quality. Additionally, biosensors and nano-sensors enable real-time monitoring of animal health and physiological parameters, facilitating precision management in livestock production. In reproductive technologies, nanotechnology improves the efficiency of sperm and oocyte selection, cryopreservation, and fertilization. Nano-purification techniques, such as magnetic nanoparticle-assisted sperm selection, offer promising outcomes for reproductive success. Furthermore, the latest advancements of nanotechnology in animal production, and biogenic selenium nanoparticles present a novel area of research for animal nutrition. Recent studies indicated that these nanoparticles exhibit low toxicity, enhance antioxidant activity, and boost the immune system. The chapter will also address the impact of biogenic selenium nanoparticles on the quality of meat, eggs, and milk. However, challenges regarding nanoparticle toxicity, regulatory approval, and the economic feasibility of veterinary applications remain. As nanotechnology progresses, it is expected to play a pivotal role in optimizing animal health, reproduction, and production systems, thereby contributing to sustainable livestock farming and addressing global food security challenges.