Copenhagen Zoo performs artificial insemination on female panda after years of failed natural mating

The female panda at Copenhagen Zoo has undergone artificial insemination after six years of unsuccessful attempts at natural mating, zoo officials confirmed early Wednesday, DR reports.

Zoo director Mads Frost Bertelsen said staff acted during a narrow fertility window of less than 24 hours, sedating the male panda to collect semen before inseminating the female in the early morning. “There’s nothing wrong with the panda itself—it’s simply adapted to a very specific lifestyle,” he explained.

The pair, Mao Sun (female) and Xing Er (male), have repeatedly failed to mate naturally despite being placed together during the female’s brief annual estrus period of two to three days. Bertelsen suggested their lack of success may stem from early separation from their mothers in captivity, leaving them without key social and reproductive behaviors. “They haven’t learned to ‘speak panda,’ so to speak,” he said.

Pandas’ low-energy diet—over 20 kilograms of bamboo daily—limits their reproductive opportunities, but Bertelsen noted that in the wild, where they can locate each other by scent, mating typically succeeds. Human encroachment and habitat destruction disrupted this balance, he added.

Both pandas, born in 2013 and 2014 at China’s Wolong Panda Reserve, arrived in Copenhagen in 2019 as part of an international breeding program. Conservation efforts have improved the species’ status from “critically endangered” to “vulnerable,” though captive breeding challenges persist. Chinese programs now allow cubs to stay longer with their mothers to address behavioral gaps.

Zoo staff will know by summer whether the procedure succeeded in producing cubs.