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פותח על ידי קלירמאש פתרונות בע"מ -
Cooling management effects on dry matter intake, metabolic hormones levels and welfare parameters in dairy cows during heat stress
Year:
2020
Source of publication :
Journal of Dairy Research
Authors :
בן-מאיר, יהושב
;
.
גסיטוע, חיים
;
.
גרשון, ערן
;
.
הלחמי, אילן
;
.
יעקובי, שמאי
;
.
לויט, ח'
;
.
מירון, יהושע
;
.
פרידמן, אביה
;
.
קלייניאן-אלעזרי, אלונה
;
.
שינדר, דמיטרי
;
.
Volume :
87
Co-Authors:
Facilitators :
From page:
64
To page:
69
(
Total pages:
6
)
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.

Note:
Related Files :
Cooling management
Dry matter intake (DMI)
Ghrelin
heat stress
Leptin
עוד תגיות
תוכן קשור
More details
DOI :
10.1017/S0022029919001055
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
46774
Last updated date:
02/03/2022 17:27
Creation date:
16/03/2020 16:31
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Scientific Publication
Cooling management effects on dry matter intake, metabolic hormones levels and welfare parameters in dairy cows during heat stress
87
Cooling management effects on dry matter intake, metabolic hormones levels and welfare parameters in dairy cows during heat stress

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.

Scientific Publication
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