Longtime New Mexico cattle rancher Judy Keeler is keenly aware of how tough it is to raise livestock in the dusty desert near the U.S.-Mexico border.

Drought, intense heat, security and illegal immigrants who cut down ranchers' fences and drink water meant for livestock are constant concerns.

But Miss Keeler and fellow ranchers now have another worry.

The border fence, installed by the Department of Homeland Security to keep cars and people from crossing into the United States illegally, isn't so good at blocking cattle in some places. The new fence replaced previous livestock fences at some points, and some stretches are so low that cows can step right over it.

Because regulations in Mexico are less strict, Mexican herds are more likely to have bovine tuberculosis and other communicable diseases.

To read the entire article, link to The Washington Post.