Journal article

Metabolic and production responses to calcidiol treatment in mid-lactation dairy cows

RM Rodney, P Celi, JJ Mcgrath, HM Golder, ST Anderson, DM Mcneill, DR Fraser, IJ Lean

Animal Production Science | Published : 2018


The study of vitamin D in cattle has often focussed on its role in calcium and mineral metabolism. However, there is evidence of a wider role for vitamin D in bone and energy metabolism. Two studies were conducted to explore relationships between calcidiol supplementation, blood minerals and metabolites in mid-lactation dairy cows. In Experiment 1, a dose-response study was conducted in which 25 mid-lactation cows were fed one of five supplementary calcidiol doses (0, 0.5, 1, 2 or 4 mg calcidiol/day) for 30 days, with blood samples taken every 10 days. Increasing calcidiol dose increased plasma calcidiol (P=0.001), 24,25-(OH)2-D3 (P=0.001) and serum phosphate (P=0.003) in a curvilinear manne..

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University of Melbourne Researchers

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