Even with multiple physiological adaptations in place to maintain normocalcemia, many cows fail to meet this demand without compromising systemic Ca status. As a result, these cows can experience clinical hypocalcemia or, in the absence of clinical symptoms, be categorized as having subclinical hypocalcemia based on blood Ca concentration. Our objectives were to determine: 1) the effect of a single dose of an oral Ca bolus within 24 h after parturition on blood Ca concentration, 2] the response of primiparous (PP) and multiparous (MP) cows to this supplementation strategy, and 3) differential responses to supplementation based on blood Ca concentration at enrollment.
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