The Type dimension of Lab Rat segmentation distinguishes among genetically defined strains that exhibit divergent physiological and behavioral phenotypes. Primary strains include Sprague‑Dawley, Wistar, Long‑Evans, and Fischer 344, each accounting for a distinct share of global demand. Sprague‑Dawley rats, characterized by robust breeding efficiency and moderate size, dominate the market, contributing approximately 40 % of total unit volume, driven by their suitability for high‑throughput toxicology screens. Wistar rats, noted for their calmer temperament, represent roughly 25 % and are preferred in neurobehavioral studies where stress reactivity influences outcomes. Long‑Evans, with superior visual acuity, capture about 20 % of the market, supporting ophthalmic and cognitive research. Fischer 344, a genetically inbred line, accounts for the remaining 15 % and is essential for aging and immunology investigations. This strain‑based taxonomy clarifies how each type underpins specific research protocols, thereby shaping the overall Lab Rat market size through differentiated pricing, breeding costs, and regulatory acceptance. Consequently, manufacturers align production capacity with these strain preferences to optimize supply‑chain efficiency and meet regional regulatory mandates.