Study Finds Captivity Alters Gut Microbiome of Bengal Tigers

Scientists from the Zoological Survey of India conducted a comparative analysis of fecal samples collected from captive Bengal tigers housed in zoos across the country and from wild individuals tracked in protected reserves. Using high‑throughput sequencing, the team identified a pronounced reduction in bacterial taxa associated with fiber digestion among the captive cohort, alongside an over‑representation of microbes linked to processed diets. The disparity suggests that the controlled feeding regimes and limited environmental exposure inherent to captivity reshape the gut ecosystem in ways that may affect nutrient absorption and immune function.

The study highlights an underlying tension between conservation objectives that rely on captive breeding programs and the physiological welfare of the animals involved. While ex‑situ conservation aims to safeguard genetic diversity, the altered microbiome could predispose captive tigers to metabolic disorders, gastrointestinal ailments, and reduced resilience to disease. The researchers caution that without dietary adjustments that mimic the complexity of a wild prey base, captive populations may experience health declines that compromise breeding success and long‑term viability.

If the microbiome differences are not addressed, the downstream consequences could extend to reintroduction efforts, where animals accustomed to a simplified gut flora may struggle to adapt to natural foraging conditions, jeopardising the success of restoration projects. The findings may prompt zoos and wildlife sanctuaries to revise feeding protocols, incorporate probiotic supplementation, and design habitats that encourage natural foraging behaviours. Such measures could enhance the overall health of captive tigers and improve the prospects of future releases into the wild.