What health issue may feedlot cattle develop when consuming grain rations high in phosphorus?

Feedlot cattle that consume grain rations high in phosphorus are at risk of developing phosphate calculi. These are mineral deposits that can form in the urinary system, particularly in the urethra and bladder. The high level of phosphorus in their diet can lead to an imbalance in calcium and phosphorus ratios, causing the precipitation of excess phosphorus into calcifications, which can obstruct the urinary tract and create significant health issues for the animal.

Phosphate calculi can lead to serious complications, including pain, difficulty urinating, and even rupture of the bladder, which can be fatal if not treated promptly. Addressing dietary phosphorus levels is crucial in preventing the formation of these calculi and maintaining the overall urinary health of feedlot cattle.