Animal health issues in Texas threaten global markets

Texas ranchers and animal health officials are confronting a pair of dangerous livestock threats - one an old enemy that has never fully disappeared, the other a flesh-eating parasite once thought eradicated from the United States.

From the cattle fever tick entrenched along the Rio Grande to the northward advance of the New World screwworm, the state is again on the front lines of a battle that carries enormous consequences for livestock producers and the broader agricultural economy.

Farm Bureau...