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Cooling management effects on dry matter intake, metabolic hormones levels and welfare parameters in dairy cows during heat stress

Published online by Cambridge University Press:  02 March 2020

Alona Kleinjan-Elazary ,
Yehoshav Ben-Meir ,
Haim Gacitua ,
Harel Levit ,
Avia Fridman ,
Dima Shinder ,
Shamay Jacoby ,
Joshua Miron ,
Ilan Halachmi  and
Eran Gershon
Alona Kleinjan-Elazary
Affiliation:
Department of Ruminant Science, Agricultural Research Organization, PO Box 6, Rishon LeZion50250, Israel Department of Animal Sciences, The Robert H. Smith Faculty of Agriculture, Food, and Environment, The Hebrew University of Jerusalem, Rehovot7612001, Israel
Yehoshav Ben-Meir
Affiliation:
Department of Ruminant Science, Agricultural Research Organization, PO Box 6, Rishon LeZion50250, Israel Department of Animal Sciences, The Robert H. Smith Faculty of Agriculture, Food, and Environment, The Hebrew University of Jerusalem, Rehovot7612001, Israel
Haim Gacitua
Affiliation:
Department of Ruminant Science, Agricultural Research Organization, PO Box 6, Rishon LeZion50250, Israel
Harel Levit
Affiliation:
Department of Animal Sciences, The Robert H. Smith Faculty of Agriculture, Food, and Environment, The Hebrew University of Jerusalem, Rehovot7612001, Israel Agricultural Engineering, Agricultural Research Organization, PO Box 6, Rishon LeZion50250, Israel
Avia Fridman
Affiliation:
Department of Ruminant Science, Agricultural Research Organization, PO Box 6, Rishon LeZion50250, Israel
Dima Shinder
Affiliation:
Poultry and Aquaculture Sci. Department, Agricultural Research Organization, PO Box 6, Rishon LeZion50250, Israel
Shamay Jacoby
Affiliation:
Department of Ruminant Science, Agricultural Research Organization, PO Box 6, Rishon LeZion50250, Israel
Joshua Miron
Affiliation:
Department of Ruminant Science, Agricultural Research Organization, PO Box 6, Rishon LeZion50250, Israel
Ilan Halachmi
Affiliation:
Agricultural Engineering, Agricultural Research Organization, PO Box 6, Rishon LeZion50250, Israel
Eran Gershon*
Affiliation:
Department of Ruminant Science, Agricultural Research Organization, PO Box 6, Rishon LeZion50250, Israel
*
Author for correspondence: Eran Gershon, Email: [email protected]
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Abstract

This research paper addresses the hypothesis that intensive cooling management during the summer improves the secretion of metabolic hormones in dairy cows. To test this hypothesis, we characterized the effect of different cooling managements on the different ghrelin isoforms and leptin secretion of 20 Israeli-Holstein dairy cows during 5 weeks during heat stress. The cows were divided into two groups: one was exposed to 5 cooling sessions per day (5 CS) and the other to 8 cooling sessions per day (8 CS). Blood was collected and leptin and ghrelin isoforms level were radioimmunoassayed. Analysis of the interaction between coolings and the week of the experiment showed that the 8 CS group consumed more food and produced more milk, although neither difference was statistically significant. In addition, the 8 CS group exhibited higher blood levels of acyl-ghrelin and leptin as compared to the 5 CS group. Conversely, the blood levels of total ghrelin were lower in the cows exposed to 8 CS as compared to cows from the 5 CS treatment. Furthermore, a significant correlation was found only between total ghrelin levels and the weeks, but not with other parameters examined. We further compared digestibility as well as stress parameters between the groups. We found that the 8 CS group cows ruminated and lay down more hours during a day and simultaneously had better activity time. No significant difference was detected between groups in milk yield and digestibility parameters. Our results suggest that intensive cooling management during the hot season influences the levels of metabolic hormones in the circulation and helps to mitigate the detrimental effect of heat stress on dairy cow welfare and production.

Keywords

Cooling managementDMIGhrelinheat stressLeptin
Type
Research Article
Information
Journal of Dairy Research , Volume 87 , Issue 1 , February 2020 , pp. 64 - 69
Copyright
Copyright © Hannah Dairy Research Foundation 2020

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