Image: Mei Xiang
Jacquelyn Martin  /  AP
In a photo from February, Mei Xiang rolls herself down a snowy hill at the National Zoo in Washington.
updated 4/28/2010 10:58:19 AM ET 2010-04-28T14:58:19

The National Zoo says its female giant panda is not pregnant after all.

The zoo says a final ultrasound and hormone analysis late Tuesday confirmed Mei Xiang (may-SHONG) was experiencing a pseudo pregnancy over the past several months.

Volunteers at the zoo began a 24-hour pregnancy watch Friday as Mei Xiang's hormone levels began to level out. This is the fifth time she's experienced a pseudo pregnancy.

In 2005, Mei Xiang gave birth to her only cub, Tai Shan (TY-shawn). He was sent to a breeding program in China earlier this year.

This may have been the zoo's last chance to breed Mei Xiang and male Tian Tian (tee-YEN tee-YEN). A 10-year loan for the pair expires at the end of the year. The bears could be returned to China at that time.

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