Choline bolus compositions for ruminants

A solid bolus composition for the simultaneous prevention or treatment of hypocalcemia and a choline deficiency in a ruminant, comprising:

• an inner mass comprising:
• a rumen-protected choline at about 5 wt % to about 20 wt % of the solid bolus composition;
• one or more calcium salts at about 65 wt % to about 85 wt % of the solid bolus composition;
• water at about 15 wt % to about 25 wt % of the solid bolus composition;
• and
• a binder at about 0.1 wt % to about 1 wt % of the solid bolus composition, and
• an outer mass being a coating comprising acetyl esters of triglycerides capable of passage through the esophagus for dissolution in the rumen of the ruminant to release the rumen-protected choline and the one or more calcium salts into the rumen,
• wherein the solid bolus composition has a total weight of between about 200 g and about 250 g and is for administration to the ruminant using a balling gun.