Solid post-calving support. Calcium bolus supplement for adult dairy cattle having the ability to swallow at calving. Calcium gets to bloodstream within first hour and persists through 12 hours with 4 carefully selected calcium sources for rapid and sustained calcium support. Feature rapidly available calcium sources typically lacking in most "slow release" calcium or CMPK boluses; and sustained availability calcium often lacking in gel tubes and drenches, without the mess or risk of aspiration. Contain vitamin D3, for calcium utilization in the body, and propionate cows can utilize for energy. Provide niacin to aid liver function during negative energy balance. Added yeast culture for appetite support. Convenient application - smaller bolus and rounded profile for smooth, safe and easy administration.