Why is calcium supplementation important in early lactation?

• A. To enhance fiber digestion
• B. To reduce methane emissions
• C. To replace energy
• D. To prevent milk fever due to sudden calcium demand

Answer: (D)

In early lactation the cow’s need for calcium spikes as milk calcium secretion increases. The rapid demand can overwhelm the animal’s ability to absorb calcium from the gut and mobilize it from bone right at calving, leading to a drop in blood calcium called milk fever. Calcium supplementation around this time provides an immediate source of calcium, helping to keep blood calcium levels stable, support muscle function and rumen motility, and reduce the risk and consequences of milk fever. It’s not about fiber digestion, methane, or replacing energy—the main benefit is preventing hypocalcemia due to the sudden calcium drain.