<abstract xmlns="http://www.w3.org/1999/xhtml">

<sec id="j_jvetres-2020-0053_s_005"><h3>Introduction</h3>
<p>The aim of this study was to determine changes of reactive oxygen species (ROS), serum antioxidant capacity (SAC), oxidative stress index (OSi), and <italic>α</italic>-tocopherol (<italic>α</italic>-T) during the periparturient period in healthy and mastitic cows and to further investigate whether these parameters can be used as a tool for identifying cows at higher risk of developing mastitis.</p></sec>
<sec id="j_jvetres-2020-0053_s_006"><h3>Material and Methods</h3>
<p>Blood samples from 110 dairy cows from two commercial farms were obtained at dry-off, calving, and 30 days post-partum. Healthy cows formed group A (n = 90) and mastitic cows B (n = 20). Blood serum was obtained by centrifugation, and the aforementioned parameters were determined. A general linear model was used for analysing the associations among the determined blood parameters, the health of the animals’ udder, and the sampling time.</p></sec>
<sec id="j_jvetres-2020-0053_s_007"><h3>Results</h3>
<p>ROS and OSi values were higher (P &lt; 0.001) by a respective 14% and 26%, and SAC values lower (P &lt; 0.001) by 10% in group B than in group A at calving. ROC curve analysis revealed that all determined parameters at calving and <italic>α</italic>-T at dry-off and 30 days post-partum had excellent or acceptable predicting ability for mastitis incidence.</p></sec>
<sec id="j_jvetres-2020-0053_s_008"><h3>Conclusion</h3>
<p>This information provides a tool for early identification of cows at high risk of developing mastitis, allowing the implementation of intervention strategies.</p></sec></abstract>

Introduction
The aim of this study was to determine changes of reactive oxygen species (ROS), serum antioxidant capacity (SAC), oxidative stress index (OSi), and α-tocopherol (α-T) during the periparturient period in healthy and mastitic cows and to further investigate whether these parameters can be used as a tool for identifying cows at higher risk of developing mastitis.
Material and Methods
Blood samples from 110 dairy cows from two commercial farms were obtained at dry-off, calving, and 30 days post-partum. Healthy cows formed group A (n = 90) and mastitic cows B (n = 20). Blood serum was obtained by centrifugation, and the aforementioned parameters were determined. A general linear model was used for analysing the associations among the determined blood parameters, the health of the animals’ udder, and the sampling time.
Results
ROS and OSi values were higher (P < 0.001) by a respective 14% and 26%, and SAC values lower (P < 0.001) by 10% in group B than in group A at calving. ROC curve analysis revealed that all determined parameters at calving and α-T at dry-off and 30 days post-partum had excellent or acceptable predicting ability for mastitis incidence.
Conclusion
This information provides a tool for early identification of cows at high risk of developing mastitis, allowing the implementation of intervention strategies.

Association of oxidative stress biomarkers and clinical mastitis incidence in dairy cows during the periparturient period

Journal of Veterinary Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Introduction
The aim of this study was to determine changes of reactive oxygen species (ROS), serum antioxidant capacity (SAC), oxidative stress index (OSi),...

Association of oxidative stress biomarkers and clinical mastitis incidence in dairy cows during the periparturient period

Article Category: Short Communication

Published Online: Aug 12, 2020

Page range: 421 - 425

Received: Jan 19, 2020

Accepted: Jul 30, 2020

DOI: https://doi.org/10.2478/jvetres-2020-0053

Keywords
dairy cows, mastitis, oxidative stress biomarkers, -tocopherol, early mastitis risk identification

© 2020 G.P. Laliotis et al. published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Association of oxidative stress biomarkers and clinical mastitis incidence in dairy cows during the periparturient period

Article Category: Short Communication

Published Online: Aug 12, 2020

Page range: 421 - 425

Received: Jan 19, 2020

Accepted: Jul 30, 2020

DOI: https://doi.org/10.2478/jvetres-2020-0053

Keywordsdairy cows, mastitis, oxidative stress biomarkers, -tocopherol, early mastitis risk identification

© 2020 G.P. Laliotis et al. published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
dairy cows, mastitis, oxidative stress biomarkers, -tocopherol, early mastitis risk identification