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Effects of mild heat stress periods on milk production, milking frequency and rumination time of grazing cows milked by an automatic milking system
Lessire, Françoise; Hornick, Jean-Luc; Dufrasne, Isabelle
2014In Hopkins, A; Collins, Rosemary; Fraser, Mariecia et al. (Eds.) EGF at 50: The future of European grasslands
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Keywords :
grazing; dairy cows; heat stress; automatic milking system; rumination; milking frequency
Abstract :
[en] Grazing dairy cows milked by an automatic system (AS) experienced mild heat stress (HS) periods, twice during the summer. The daily temperature humidity index (THI) during these periods were higher than 72. Milk production, as well as milking frequency, rumination time and milk fat to protein ratio (F/P) during these periods were compared to adjacent periods with mean THI of 61. The daily milking frequency, the total number of visits to AS and the milk production were significantly higher in HS periods (2.12 vs 1.97, 2.99 vs 2.69, and 19.7 vs 18.5 kg milk per cow, respectively). There were significant interactions between times and periods for milking frequency and number of visits, while the daily rumination time was significantly lower (339 vs 419 min) and the F/P in milk tended to be decreased (1.17 vs 1.23). These results could be explained by changes in cow behaviour during HS periods.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Lessire, Françoise  ;  Université de Liège - ULiège > Département de productions animales > LESNA
Hornick, Jean-Luc  ;  Université de Liège - ULiège > Département de productions animales > Nutrition animale en milieu tropical
Dufrasne, Isabelle  ;  Université de Liège - ULiège > Département de productions animales > Nutrition des animaux domestiques
Language :
English
Title :
Effects of mild heat stress periods on milk production, milking frequency and rumination time of grazing cows milked by an automatic milking system
Alternative titles :
[en] Effets de stress thermiques modérés sur la prodution laitière, la fréquence de traite et le temps de rumination de vaches au pâturage traites par un robot de traite
Publication date :
10 September 2014
Event name :
25th General Meeting of the European Grasslands Federation
Event organizer :
Aberystwyth University
Event place :
Aberystwyth, United Kingdom
Event date :
8 - 11 september 2014
Audience :
International
Main work title :
EGF at 50: The future of European grasslands
Main work alternative title :
[en] EGF à 50: le futur des prairies européennes
Editor :
Hopkins, A
Collins, Rosemary
Fraser, Mariecia
King, Vicky
Loyd, David
Moorby, Jon
Robson, Paul
Publisher :
Gomer Press Ltd, Ceredigion, United Kingdom
Edition :
Volume 19
ISBN/EAN :
978-0-9926940-1-2
Pages :
181-183
Peer reviewed :
Peer reviewed
European Projects :
FP7 - 314879 - AUTOGRASSMILK - Innovative and sustainable systems combining automatic milking and precision grazing
Name of the research project :
Autograssmilk
Funders :
UE - Union Européenne [BE]
CE - Commission Européenne [BE]
Available on ORBi :
since 11 September 2014

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