In the past several months, Dennis Schmitt's team has brought one African and one Asian elephant into the world, the first-ever products of artificial insemination of elephants.

Schmitt didn't start out to be an elephant midwife. Growing up on a dairy farm outside Springfield, Mo., he had no idea that someday he would be flying all over the globe to circuses and zoos, cradling a container of elephant semen in his lap.

A veterinarian at Dickerson Park Zoo in Springfield, Schmitt heads one of the largest elephant-breeding programs in the country. He also teaches veterinary medicine at a nearby university. But what he's most proud of is his role in artificially inseminating African and Asian elephants, and delivering their 400-pound babies.

Schmitt has delivered a total of 14 elephant babies in his career. He must be a patient guy because the gestation period is quite long. The first baby, an Asian named Haji, was born after the mother's 674-day pregnancy. "It was an amazing experience," Schmitt told the Associated Press.

Elephants have many problems reproducing, according to Schmitt, partly because there aren't many of the creatures left on the planet. African elephants number about 500,000, with 5,000 in captivity. But there are only 50,000 or so Asian elephants, with 10,000 in captivity. Most Asian elephants are past their reproductive age, so accelerating their birthrate is especially important.

Schmitt has developed a good eye for a healthy potential elephant mom. Teenagers and those in their 20s usually are best, because elephants over 30 can develop tumors and ovarian cysts.

"Are their reproductive tracts in good physical shape?" asks Schmitt. "Are their blood cycles regular? Are they socially mature enough to handle becoming a mother? These are the types of things we are looking for in a good mom."

Traditionally, zoos have had little success in breeding elephants, in part because they're not equipped to house the aggressive adult males. And transporting the males is difficult and expensive. Schmitt and his team have found success using artificial insemination and employing ultrasound to determine the females' reproductive cycles. The group is currently working on freezing elephant semen for travel.

Whether it's a result of the faint aroma of the semen he carries or not, many of the mother elephants recognize him when he returns to a zoo or circus, Schmitt says. Occasionally he's greeted by an elephant raising its tail and defecating.

"I'm just happy that they remembered me," he says.