<abstract xmlns="http://www.w3.org/1999/xhtml"><p> The objectives were to evaluate the effect of heat stress on daily milk traits (yield, fat and protein content, F/P ratio) as well as to determine the differences in metabolic disorders (acidosis, ketosis) prevalence risk regarding the heat stress conditions. For statistical analysis 1,187,781 test-day records of milk, fat, and protein from 89,030 Holsteins reared on 6,388 farms provided by the Croatian Agricultural Agency, were used. Based on the results it could be concluded that heat stress condition causes decline of daily milk yield and components as well as increase of acidosis risk regardless of the lactation stage and increase of ketosis risk during mid-lactation. The research results point out that the test-day records and environmental measurements collected in regular milk recording could be used as a tool for dairy herd monitoring enabling the early detection of unfavourable environmental conditions and the subclinical disorders. Since environmental conditions significantly affect daily milk yield and components, and consequently F/P ratio, further research with the purpose of detailed formulation of metabolic disease risk in relation to the environmental conditions is needed.</p></abstract>

The objectives were to evaluate the effect of heat stress on daily milk traits (yield, fat and protein content, F/P ratio) as well as to determine the differences in metabolic disorders (acidosis, ketosis) prevalence risk regarding the heat stress conditions. For statistical analysis 1,187,781 test-day records of milk, fat, and protein from 89,030 Holsteins reared on 6,388 farms provided by the Croatian Agricultural Agency, were used. Based on the results it could be concluded that heat stress condition causes decline of daily milk yield and components as well as increase of acidosis risk regardless of the lactation stage and increase of ketosis risk during mid-lactation. The research results point out that the test-day records and environmental measurements collected in regular milk recording could be used as a tool for dairy herd monitoring enabling the early detection of unfavourable environmental conditions and the subclinical disorders. Since environmental conditions significantly affect daily milk yield and components, and consequently F/P ratio, further research with the purpose of detailed formulation of metabolic disease risk in relation to the environmental conditions is needed.

11. Effect of Heat Stress on Metabolic Disorders Prevalence Risk and Milk Production in Holstein Cows in Croatia

Department of Special Zootechnics, Faculty of Agriculture in Osijek, University of Josip Juraj Strossmayer in Osijek, Kralja Petra Svačića 1d, 31000 Osijek, Croatia

Inagra Ltd., J.J. Strossmayera 341, 31000 Osijek, Croatia

Department of Animal Science, Biotechnical Faculty, University of Ljubljana, Groblje 3, Domžale, Slovenia

Annals of Animal Science

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

The objectives were to evaluate the effect of heat stress on daily milk traits (yield, fat and protein content, F/P ratio) as well as to determine the...

11. Effect of Heat Stress on Metabolic Disorders Prevalence Risk and Milk Production in Holstein Cows in Croatia

Article Category: The Biology, Physiology, Reproduction, and Health

Published Online: May 06, 2016

Page range: 451 - 461

Received: Mar 16, 2015

Accepted: Jan 12, 2016

DOI: https://doi.org/10.1515/aoas-2015-0097

Keywords
acidosis, ketosis, temperature-humidity index, test-day records, prevalence risk

© by Vesna Gantner

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

11. Effect of Heat Stress on Metabolic Disorders Prevalence Risk and Milk Production in Holstein Cows in Croatia

Article Category: The Biology, Physiology, Reproduction, and Health

Published Online: May 06, 2016

Page range: 451 - 461

Received: Mar 16, 2015

Accepted: Jan 12, 2016

DOI: https://doi.org/10.1515/aoas-2015-0097

Keywordsacidosis, ketosis, temperature-humidity index, test-day records, prevalence risk

© by Vesna Gantner

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
acidosis, ketosis, temperature-humidity index, test-day records, prevalence risk