Potentially hazardous sulfur conditions on beef cattle ranches in the United States.

Objective: To analyze the sulfur content of water and forage samples from a geographically diverse sample of beef cow-calf operations in the United States and to estimate frequency and distribution of premises where forage and water resources could result in consumption of hazardous amounts of sulfur by cattle.

Design: Cross-sectional study.

Sample Population: 709 forage samples from 678 beef cow-calf operations and individual water samples from 498 operations in 23 states.