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Prediction of Body Weight of Primiparous Dairy Cows Throughout Lactation
Vanrobays, Marie-Laure; Vandenplas, Jérémie; Hammami, Hedi et al.
2014In Proceedings of the 10th World Congress on Genetics Applied to Livestock Production
Peer reviewed
 

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Keywords :
dairy cattle; body weight; feed intake
Abstract :
[en] Body weight (BW) can be computed using linear conformation traits (CBW). However, these traits are recorded mostly once during a lactation. Therefore, predicted BW (PBW) is needed throughout the lactation (e.g., allowing feed intake prediction in milk recording systems). A two-step procedure was developed to obtain PBW using a random regression test-day model using CBW as observations. Added second step consisted in changing prior distribution for additive genetic random effects using results from first step to predict again PBW. This method was applied on 24,919 primiparous Holstein cows having 25,061 CBW to obtain PBW for 232,436 test-days. Results showed that applying both steps provided more accurate estimates than using only the first step. Furthermore, this procedure predicting PBW throughout lactation is also extremely flexible because actual BW can also be used together with CBW, the prediction model being able to accommodate different levels of accuracies.
Disciplines :
Genetics & genetic processes
Animal production & animal husbandry
Author, co-author :
Vanrobays, Marie-Laure ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Vandenplas, Jérémie ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Hammami, Hedi ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Gengler, Nicolas  ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Language :
English
Title :
Prediction of Body Weight of Primiparous Dairy Cows Throughout Lactation
Alternative titles :
[fr] Prédiction du poids vif des vaches laitières en première lactation tout au long de la lactation
Publication date :
August 2014
Event name :
10th World Congress on Genetics Applied to Livestock Production (WCGALP)
Event place :
Vancouver BC, Canada
Event date :
August 17-22, 2014
Audience :
International
Main work title :
Proceedings of the 10th World Congress on Genetics Applied to Livestock Production
Peer reviewed :
Peer reviewed
Available on ORBi :
since 25 July 2014

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