Journal article
Effects of prepartum dietary cation-anion difference and source of vitamin D in dairy cows: Vitamin D, mineral, and bone metabolism
RM Rodney, N Martinez, E Block, LL Hernandez, P Celi, CD Nelson, JEP Santos, IJ Lean
Journal of Dairy Science | ELSEVIER SCIENCE INC | Published : 2018
Abstract
Pregnant Holstein cows, 28 nulliparous and 51 parous, were blocked by parity and milk yield and randomly allocated to receive diets that differed in dietary cation-anion difference (DCAD), +130 or −130 mEq/kg, and supplemented with either calcidiol or cholecalciferol at 3 mg/11 kg of dry matter from 255 d of gestation until parturition. Blood was sampled thrice weekly prepartum, and on d 0, 1, 2, 3, 6, 9, 12, 15, 18, 21, 24, 27, and 30 postpartum to evaluate effects of the diets on vitamin D, mineral and bone metabolism, and acid-base status. Blood pH and concentrations of minerals, vitamin D metabolites, and bone-related hormones were determined, as were mineral concentrations and losses in..
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Funding Acknowledgements
The authors thank Rafael S. Bisinotto, Andre L. G. Dias, Jose Freitas, Gabriel C. Gomes, Leandro F. Greco, Camilo Lopera, Kathryn Merriman, Kaitlin M. O'Connor, Adele Pietras, Guilherme C. S. Pontes, Eduardo S. Ribeiro, Rosiane Sales, Ricarda M. Santos, Johnathan Smith, Marcos Zenobi, and Matthew Wadford from the University of Florida (Gainesville) for their help with the conduct of the experiment; Sergei Sennikov at the University of Florida (Gainesville) for assistance with the analysis of samples; and Stephane Etheve from DSM Nutritional Products (Kaiseraugst, Switzerland) for conducting vitamin D analyses. Financial support for this experiment was provided by Arm & Hammer Animal Nutrition (Princeton, NJ), DSM Nutritional Products (Kaiseraugst, Switzerland), and Dairy Australia (Southbank, Australia).