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Effects of prepartum positive and negative dietary cation/anion differences on postpartum calcium concentration and risk factors for subclinical hypocalcemia in Holstein cows

Published online by Cambridge University Press:  05 December 2024

Mehrdad Sami*
Affiliation:
Large Animal Internal Medicine Specialist, Veterinarian in the Private Sector, Tehran, Iran
Arya Badiei
Affiliation:
Department of Clinical Sciences, Faculty of Veterinary Medicine, Islamic Azad University, Karaj, Iran
Hamed Beiranvand
Affiliation:
Department of Animal and Poultry Sciences, College of Aburaihan, University of Tehran, Tehran, Iran R&D Department of Chaltasian & Talise Asil Jahan Agro-Animal Husbandry Co., Varamin, Tehran, Iran
Farhad Moosakhani
Affiliation:
Department of Pathobiology, Faculty of Veterinary Medicine, Karaj Branch, Islamic Azad University, Karaj, Iran
Alireza Shaghayegh
Affiliation:
Department of Clinical Sciences, Faculty of Veterinary Medicine, Islamic Azad University, Karaj, Iran
Farhad Ahmadi
Affiliation:
Department of Eco-friendly Livestock Science, Institute of Green Bio Science and Technology, Seoul National University, Pyeongchang 25354, South Korea
*
Corresponding author: Mehrdad Sami; Email: [email protected]

Abstract

Insufficient data are available about the association between prepartum risk factors including dietary cation–anion difference (DCAD) status and postpartum outcomes of Holstein dairy cows within commercial management systems. The first objective of this experiment was to assess the association between postpartum serum calcium (Ca) dynamics and the risk of metritis development. The second objective was to identify the association of risk factors, including DCAD status of prepartum ration, prepartum serum macrominerals and parity, with the development of subclinical hypocalcemia (SCH) in two commercial herds. Herd A (n = 32) fed a negative DCAD close-up ration and herd B (n = 30) fed a positive DCAD close-up diet. A receiver operating characteristic (ROC) curve was run to evaluate the association of serum Ca concentration at 1, 2, and 4 DIM with the risk of developing metritis. A second ROC curve was also created to assess the association of prepartum serum Mg, P, and Ca concentration with the postpartum serum Ca concentration dichotomized into normocalcemic (>8.82 mg/dl) and subclinical hypocalcemic (≤8.82 mg/dl). A logistic regression model was created to assess prepartum DCAD status (negative vs. positive) and parity (classified into a 3-level variable as first, second and third or greater lactations) as potential predictors of SCH classification. Serum Ca concentration at DIM 4 was a significant predictor of metritis (area under the curve = 0.87; P < 0.01). Cows fed positive vs. negative prepartum DCAD diet were more likely to be classified as SCH at 4 DIM. Parity did not show a significant association with the classification of SCH at 4 DIM. Our results demonstrate the importance of the DIM of blood Ca concentration assessment in connection with the diagnosis of metritis, which is crucial for the most accurate categorization of SCH and the related risk factors.

Type
Research Article
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of Hannah Dairy Research Foundation

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