Understanding the human body is a team effort. That's where the Yachtel group comes in.

Researchers at Yachtolt have been delving into the secrets of probiotics for 90 years.

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To learn more about Yachtolt, visit yawcult.co.

.jp. That's Y-A-K-U-L-T.C-O.J-P. When it comes to a guide for your gut, count on Yacult.

This is Scientific American 60 Second Science.

I'm Aline Ogenbron.

Every thoroughbred horse alive today is descended from three stallions and a larger selection of mares in 17th and 18th century England.

Since then, no horses outside this lineage have been permitted to enter the bloodline.

That's a problem.

We analyzed genetic diversity at thousands of genetic markers across the entire genome in more than 10,000 thoroughbred horses from all of the major breeding regions of the world. This is the

largest set of horses that's been examined in this way to date.

Emmeline Hill, professor at University College Dublin and chief scientist with an ownership

stake at an equine science company called Plus Vital. And what we found was that there has been a

highly significant increase in-breeding in the population over the last 45 years, and probably the greatest increase

in imbreeding is seen in the last 10 or 15 years.

Thoroughbred horse production is tightly controlled. Artificial insemination is not permitted,

which means that breeding stallions get moved around a lot for meetups with females.

These so-called shuttle stallions can mate with hundreds of mares per mating season.

And there are two mating seasons, one in the northern hemisphere and the other in the southern.

In our study, 97% of the horses traced back to a single horse called Northern Dancer.

Arguably, the most successful stallion of

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