A dietary strategy(飲食策略) to minimize the risk(降低風險) of clinical and subclinical hypocalcemia is the manipulation of the mineral content of prepartum diets to induce a compensated metabolic acidosis by feeding acidogenic diets.Prepartum diets with negative DCAD reduce clinical and subclinical hypocalcemia in dairy cows (Ender et al., 1971; Block, 1984; Martinez et al., 2018b), and the prevention of hypocalcemia by acidogenic diets also reduces the risk of retained placenta and metritis and improves lactation performance in parous cows