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Calgary Zoo hopes team effort produces baby panda

Female pandas are selective about their mates, are in estrus only once a year for about two days, and may harbor a fertilized embryo for up to five months before it attaches to the uterine wall, all of which complicate conservation efforts. Veterinarians at Calgary Zoo partnered with their colleagues at the University of Calgary Faculty of Veterinary Medicine and the Toronto Zoo to artificially inseminate Er Shun, a female panda who had rejected a potential mate, and veterinarians will monitor her closely over the coming months.

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