FVH Wiederkäuer Practice Questions - Fachtierarzt FVH Für Wiederkäuer (Switzerland) Exam

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What is the primary physiological mechanism by which a negative Dietary Cation-Anion Difference (DCAD) diet fed to dry cows in the final 3 weeks prepartum prevents clinical and subclinical hypocalcemia at calving?

It stimulates insulin secretion and increases renal calcium reabsorption It induces a mild systemic metabolic acidosis that enhances tissue sensitivity to parathyroid hormone (PTH) and upregulates 1,25-dihydroxyvitamin D3 synthesis It binds dietary phosphorus in the rumen, directly forcing active intestinal calcium transport It elevates blood pH, promoting calcitonin release and bone mineral deposition

Correct Answer:

It induces a mild systemic metabolic acidosis that enhances tissue sensitivity to parathyroid hormone (PTH) and upregulates 1,25-dihydroxyvitamin D3 synthesis

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