There are currently 4,000 to 6,000 bison in Yellowstone. Breeding among such a large population is a positive sign, but what made the two herds merge into one? The study suggests that there is not ...

Credit: National Park Service/Jacob W. Frank To reveal the breeding dynamics of the droves of bison in Yellowstone, workers at the National Park Service (NPS) collected tissue samples biopsied ...

For years, Yellowstone National Park was home to two distinct bison herds, each with its own breeding patterns. But new research reveals a big change: these once-separate herds have now merged ...

Population genetic studies completed just 20 years ago found that Yellowstone bison populations retained much of their historic breeding patterns and were, in fact, two unique herds living within ...

This breeding season, our goal was to increase the proportion of females born in managed care by using X-chromosome-bearing (female) sperm. In mammals, the sperm fertilizing the egg determines the sex ...