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Heat production and retained energy in lactating cows held under hot summer conditions with evaporative cooling and fed two rations differing in roughage content and in vitro digestibility
Year:
2008
Source of publication :
Animal
Authors :
Brosh, Arieh
;
.
Mabjeesh, Sameer Jermaya
;
.
Miron, Joshua
;
.
Nikbachat, Moses
;
.
Shamay, Avi
;
.
Zenou, Abraham
;
.
Volume :
2
Co-Authors:
Miron, J., Agricultural Research Organization, PO Box 6, Bet-Dagan, 50250, Israel
Adin, G., Extension Service, Ministry of Agriculture, Israel
Solomon, R., Extension Service, Ministry of Agriculture, Israel
Nikbachat, M., Agricultural Research Organization, PO Box 6, Bet-Dagan, 50250, Israel
Zenou, A., Agricultural Research Organization, PO Box 6, Bet-Dagan, 50250, Israel
Shamay, A., Agricultural Research Organization, PO Box 6, Bet-Dagan, 50250, Israel
Brosh, A., Agricultural Research Organization, PO Box 6, Bet-Dagan, 50250, Israel
Mabjeesh, S.Y., Faculty of Agriculture, Hebrew University of Jerusalem, Israel
Facilitators :
From page:
843
To page:
848
(
Total pages:
6
)
Abstract:
The objective of this study was to measure the effect of feeding two total mixed rations (TMRs), differing in their roughage content and in vitro dry matter (DM) digestibility, on the physiological response and energy balance of lactating cows. The partitioning of metabolizable energy intake (MEI) between heat production (HP) and retained energy (RE) of cows held under hot weather conditions and external evaporative cooling was measured. In all, 42 lactating cows were divided into two similar sub-groups, each of 21 animals, and were fed either a control (CON) ration containing 18% roughage neutral detergent fiber (NDF) or an experimental (EXP) TMR containing 12% roughage NDF and used soy hulls as partial wheat silage replacer. The in vitro DM digestibility of the CON and EXP TMR was 75.3% and 78.6%, respectively (P < 0.05). All cows were cooled by evaporative cooling for 2 adaptation weeks plus 6 experimental weeks under hot weather conditions. The EXP diet reduced rectal temperature and respiratory rate of the cows while increasing their DM intake (DMI) from 23.1 to 24.7 kg/cow per day, milk yield from 41.9 to 44.2 kg and yield of energy-corrected milk from 38.7 to 39.7 kg, as compared with the CON group. Cows fed the EXP TMR had increased RE in milk and body tissue, as compared with the CON group, but the diets had no effect on the measured HP that was maintained constant (130.4 v. 130.8 MJ/cow per day) in the two groups. The measured MEI (MEI = RE + HP) and the efficiency of MEI utilization for RE production were also similar in the two dietary groups. Copyright © The Animal Consortium 2008.
Note:
Related Files :
Animalia
Bos
Energy expenditure
Retained energy
Triticum aestivum
Show More
Related Content
More details
DOI :
10.1017/S1751731108001900
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
23951
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:03
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Scientific Publication
Heat production and retained energy in lactating cows held under hot summer conditions with evaporative cooling and fed two rations differing in roughage content and in vitro digestibility
2
Miron, J., Agricultural Research Organization, PO Box 6, Bet-Dagan, 50250, Israel
Adin, G., Extension Service, Ministry of Agriculture, Israel
Solomon, R., Extension Service, Ministry of Agriculture, Israel
Nikbachat, M., Agricultural Research Organization, PO Box 6, Bet-Dagan, 50250, Israel
Zenou, A., Agricultural Research Organization, PO Box 6, Bet-Dagan, 50250, Israel
Shamay, A., Agricultural Research Organization, PO Box 6, Bet-Dagan, 50250, Israel
Brosh, A., Agricultural Research Organization, PO Box 6, Bet-Dagan, 50250, Israel
Mabjeesh, S.Y., Faculty of Agriculture, Hebrew University of Jerusalem, Israel
Heat production and retained energy in lactating cows held under hot summer conditions with evaporative cooling and fed two rations differing in roughage content and in vitro digestibility
The objective of this study was to measure the effect of feeding two total mixed rations (TMRs), differing in their roughage content and in vitro dry matter (DM) digestibility, on the physiological response and energy balance of lactating cows. The partitioning of metabolizable energy intake (MEI) between heat production (HP) and retained energy (RE) of cows held under hot weather conditions and external evaporative cooling was measured. In all, 42 lactating cows were divided into two similar sub-groups, each of 21 animals, and were fed either a control (CON) ration containing 18% roughage neutral detergent fiber (NDF) or an experimental (EXP) TMR containing 12% roughage NDF and used soy hulls as partial wheat silage replacer. The in vitro DM digestibility of the CON and EXP TMR was 75.3% and 78.6%, respectively (P < 0.05). All cows were cooled by evaporative cooling for 2 adaptation weeks plus 6 experimental weeks under hot weather conditions. The EXP diet reduced rectal temperature and respiratory rate of the cows while increasing their DM intake (DMI) from 23.1 to 24.7 kg/cow per day, milk yield from 41.9 to 44.2 kg and yield of energy-corrected milk from 38.7 to 39.7 kg, as compared with the CON group. Cows fed the EXP TMR had increased RE in milk and body tissue, as compared with the CON group, but the diets had no effect on the measured HP that was maintained constant (130.4 v. 130.8 MJ/cow per day) in the two groups. The measured MEI (MEI = RE + HP) and the efficiency of MEI utilization for RE production were also similar in the two dietary groups. Copyright © The Animal Consortium 2008.
Scientific Publication
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