Compressed blocks of fine-screened salt specially formulated with sulfur to meet the requirements of most cattle. Sulfur is essential for the well-being of ruminant animals. It is a key element in all body cells and the foundation for several amino acids vital for the efficient assimilation of protein when feeding urea.
"Ruminants
include cattle, sheep, goats, buffalo, deer, elk, giraffes and camels. These animals all have
a digestive system that is uniquely different from our own.
Instead of one compartment to the stomach they have four."
http://aitc.ca/bc/uploads/ruminants.pdf