Final answer:
Dairy cattle treated with Predef are at risk for hypocalcemia, a condition of low blood calcium, which is critical during early lactation.
Step-by-step explanation:
Dairy cattle in early lactation that have been treated multiple times with Predef are at risk for severe hypocalcemia. Predef is a corticosteroid which, when used frequently, can disturb calcium metabolism in cows, particularly during the demanding period of early lactation. Hypocalcemia is a condition characterized by low levels of calcium in the blood, which can be particularly concerning for dairy cattle post-calving, as they require high levels of calcium for milk production. Additionally, given that dairy foods are a significant source of calcium, protein, and vitamin D, it's essential for dairy cattle to maintain adequate levels of these nutrients to ensure both their health and the quality of milk produced.