Genome-wide identification of selection signals in fat-tailed and thin-tailed sheep populations.

Summary: Why do some sheep have fat tails? Long ago, sheep had to survive in harsh environments where food was often scarce. To stay alive during these tough times, some sheep learned to store extra energy as fat in their tails, much like a camel stores fat in its hump! Today, scientists wanted to understand exactly how this works. They looked closely at the DNA of 555 sheep from all over the world, comparing sheep with fat tails to those with thin tails. They discovered 32 special genes—with 6 being the most important—that control how sheep store this tail fat. Understanding these genes can help farmers breed healthier sheep, adapt to changing environments, and improve the farming industry.