Comprehensive Analysis of the effects of heat stress on some blood parameters in dairy cows

Baccouri, Wissem and Wanjala, George and Tóth, Violetta and Komlósi, István and Mikó, István (2025) Comprehensive Analysis of the effects of heat stress on some blood parameters in dairy cows. ÁLLATTENYÉSZTÉS ÉS TAKARMÁNYOZÁS, 74 (1). pp. 62-76. ISSN 0230-1814

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Abstract

Heat stress in dairy cows represents one of the most significant challenges within the agricultural sector, particularly in dairy farming. Numerous studies have investigated its impact on blood parameters and overall body metabolism, yet the findings remain highly contradictory. Some research indicates that heat stress leads to elevated levels of blood markers such as alanine aminotransferase (ALT), aspartate aminotransferase (AST), β-hydroxybutyrate (BHB), and urea, while other studies report conflicting results, highlighting a lack of consistent patterns. The primary objective of this study is to synthesise and critically evaluate the effects of heat stress on selected blood parameters in dairy cows, with a focus on the robustness of existing studies. The inconsistencies in the literature emphasise the need for further research applying larger sample sizes and more rigorous experimental designs. It is imperative that future studies consider key influencing factors such as photoperiod, feeding regimens, and the timing of sample collection, as these variables can significantly affect outcomes. By addressing these limitations, researchers can contribute to a deeper understanding of how heat stress impacts blood parameters in dairy cows. Such insights are crucial for developing evidence-based strategies to mitigate the adverse effects of heat stress, ultimately improving the welfare and productivity of dairy herds.

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