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Published October 07, 2013, 12:05 PM

An unusual pair

A pair of twin calves, which they fondly named Pete and Re-Pete were born at Gehring Ranch near Helena, Mont.

By: Eve Byron, Associated Press

After more than half a century of raising bison, folks at the Gehring Ranch near Helena, Mont., know that the furry beasts are unpredictable.

That knowledge still didn’t prepare them for the gift from the bison they call Big Shirl this spring — a pair of twin calves, which they fondly named Pete and Re-Pete.

“We have had buffalo for 60 years, but never had twins,” says Rose Vincent Gehring, the matriarch of the family.

“We saw them two or three days after they were born,” adds Judith Anne Vincent, Rose’s niece. “We were kind of starting to monitor them because we knew they were going to start calving. Later, I looked on the Internet and found that the chance of having twins in bison was really, really, really rare.”

“About 0.04 percent,” chimes in her cousin Bill Gehring, who runs the family ranch.

David Carter, the executive director of the Denver-based National Bison Association, says he doesn’t have statistics on the probability, but agreed twin bison are rare.

“In the 11 or 12 years I have been around, I’ve probably heard of five instances of that,” Carter says. “He’s exactly right; it is very rare.”

Carter theorized that it is such an unusual event because bison largely remain undomesticated and in their natural state one calf is a hoof-ful for a heifer.

“I think Mother Nature intended for them to just have one, because they are undomesticated animals and historically have been out in the wild with predators … and they have time to watch one calf but not two,” Carter says. “Plus, having a calf is tough work on that mom.”

Proof is in the nursing

Initially, the Gehrings were a little skeptical about Pete and Re-Pete being twins. Unlike typical cattle operations, they don’t closely watch or confine cows that are calving because bison are wary of humans and become upset and stressed when confined.

“They don’t want you in their territory,” Bill Gehring says. “You have to treat them with the utmost respect and keep them at arms’ length.”

But he and a friend watched from afar as one of the twins nursed, then the other did, on a warm spring day shortly after their birth in June. According to bison producer websites, that’s also unusual because typically one of the calves is stronger than the other, and will out-compete the smaller one for the mother’s milk.

Both calves stick close to Big Shirl, and they’re mirror images of one another. This fall, they peered out from around her side as visitors watched from about 30 feet away, safely within the confines of a vehicle. The Gehrings are adamant that no one approach the bison on foot.

“There’s a bond there with their mom,” Vincent says. “There’s respect from those calves, who know it’s their mother and there’s no foolishness. You never see those twins when they’re not with her. They never scatter.”

Luckily, the twins are both males. If they were one bull and one heifer calf, while they develop in the uterus there can be an excess of testosterone in the womb from the male calf. Apparently, that prompts changes in the heifer’s development and while she may appear normal, they typically are known as a “freemartin” and aren’t fertile.

Rose Gehring started the herd in 1959, when she traded one of their cows for a bison calf whose owner couldn’t keep him. They called the calf Chaser because he liked to chase people, but once he grew up, they gave him wide berth.

“When he got bigger, he got mean,” Rose Gehring says.

Making the switch

Eventually, the Gehrings gave up the dairy and beef cow operations, instead switching over to bison. Their stock is regularly tested and comes back clean for brucellosis, a disease that can cause animals to abort and some ranchers fear will be transmitted to cattle — even though wild bison and elk first got the disease from imported cattle. They’re also tested for tuberculosis and other transmittable diseases before they can be moved off-site.

The Gehrings have some reinforced fences around a few thousand acres, but as the herd grew, it recognized its home territory and they rarely roam outside of it.

“They’re born here, and this is home to them,” Bill Gehring says.

The adrenaline does get pumping when it’s time to move the bison from one pasture to another or load them into trucks when they’re sold, Vincent adds. Bison are one of those “top of the food chain” mammals, who often turn a baleful eye toward those trying to move them in a certain direction, then stay put or go in another direction. But with decades of handling them under their belts, the Gehring clan has learned to roll with the bison.

“You kind of start speaking their language; Billy does it really well,” Vincent says. “They have a voice of their own.”