In 12th March, the research center sends to Japanese Tokyo's Ueno Zoo Panda "Bi Li" and "Xian Nv" once again successfully completed the natural mating.
In 4th March, The female panda "Xian Nv" appeared signs of estrus, Wolong China Giant Panda Protection and Research Center sent breeding experts with rich experience to Ueno Zoo in assisted breeding. In order not to affect the two pandas cultivate feelings, Japanese Ueno zoo suspended open to visitors. In 11st March, "Xian Nv" reached estrus Peak period, then the Ueno zoo let the two pandas lived together, they ultimately success of natural mating. In12nd March, two pandas were successfully natural mating again in the morning.
In Last year March, the two pandas have successfully carried out the natural mating. The female panda "Xian Nv" had successfully pregnant and in 5th July, 2012 gave birth to a weighing about 133 grams of female baby panda, but dead in 6 days later from pneumonia.
Japanese Ueno Zoo officials announced: "we are very happy to see the two pandas to successfully natural mating twice; it will increase the possibility of reproductive success. The parks will continually in-depth observation of the two pandas".