CINCINNATI (AP) -- The Cincinnati Zoo is hoping a rhino's second pregnancy will result in what officials say would be the world's first live birth of an Indian rhinoceros conceived through artificial insemination.
Zoo officials also say a successful delivery for 18-year-old Nikki would result in the first such calf produced using frozen and thawed sperm.
The nearly 2-ton rhino gave birth to a stillborn calf in 2008.
The new delivery is expected in October 2010.
Nikki is on loan from the Toronto Zoo and is 133 days into a 480-day gestation period. The sperm came from a 38-year-old Indian rhino at the Bronx Zoo.
Male Indian rhinos have been known to injure females in natural breeding. The Indian rhino is ranked vulnerable on a threatened species list.
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