2015 • In Conington, J; Klopcic, M; Lauridsen, Cet al. (Eds.) Book of abstracts of the 66th Annual meeting of the European Federation of animal science
[en] In Europe, analysis of meteorological data shows that the average temperature has increased by ~1°C over the past hundred years (IPCC, 2013). Heat stress periods are thus expected to be more frequent even in temperate areas. The use of an automatic milking system (AMS) implies the need to stimulate cows’ traffic to the robot, especially with grazing cows. Describing how heat stress influenced cows’ traffic to the robot is the aim of this study. Grazing dairy cows milked by an automatic system (AMS) experienced heat stress (HS) periods, twice during the summer 2013 in July (J) and August (A). The daily temperature humidity index (THI) during these periods were higher than 75. Each HS period was compared with a “normal period”(N), presenting the same number of cows, similar lactation number, days in milk, distance to come back to the robot and an equal access to water. The first HS period of 5 days with a mean THI of 78.4 was chosen in J, and a second that lasted for 6 days in A with a THI value of 77.3. Heat stress periods were cut off with the same duration of days with no stress (N) and mean THI <70. Milk production, milkings and refusals to the robot during HS were compared with N periods. Milkings and refusals were significantly more numerous in HS periods in July (HS: 2.54 ± 0.11 vs N: 2.19 ± 0.08, 1.87 ± 0.20 vs 0.72 ± 0.16) but milk production dropped from 21.8 ±0.6 kg per cow and per day during N periods to 18.9 ± 0.8 kg in HS. In August, MY increased slightly during HS. This could be explained by less high ambient temperatures and decreased distance to walk inducing less energy expenditure. The increase in milkings and refusals to the robot during HS could be linked to water availability nearby the robot and confirmed previous findings (Lessire et al., 2014).
Research Center/Unit :
Ferme expérimentale du Sart Timan
Disciplines :
Animal production & animal husbandry
Author, co-author :
Lessire, Françoise ; Université de Liège > Département de productions animales > LESNA
Hornick, Jean-Luc ; Université de Liège > Département de productions animales > Nutrition animale en milieu tropical
Minet, Julien ; Université de Liège > DER Sc. et gest. de l'environnement (Arlon Campus Environ.) > Eau, Environnement, Développement
Dufrasne, Isabelle ; Université de Liège > Département de productions animales > Nutrition des animaux domestiques
Language :
English
Title :
Milk production, milking frequency and rumination time of grazing dairy cows milked by a mobile milking robot.
Alternative titles :
[en] Production laitère, fréquence de traite and temps de rumination de vaches laitères traites en prairie par un robot de traite mobile.
Publication date :
28 September 2015
Event name :
66th Annual meeting of the European Federation of animal science
Event organizer :
The european Federation of Animal Science
Event place :
Warsaw, Poland
Event date :
31/8/2015 au 4/9/2015
Audience :
International
Main work title :
Book of abstracts of the 66th Annual meeting of the European Federation of animal science
Main work alternative title :
[en] Livre des résumés des communications faites au 66ème congrès de l'association Euopéenne des sciences animales
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