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Expressing female fertility in the Walloon region of Belgium: how to do?
Vanderick, Sylvie; Bastin, Catherine; Gengler, Nicolas
2009The 2009 Interbull Meeting
 

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Keywords :
Female fertility; Pregnancy rate; correlations
Abstract :
[en] Since September 2007, the Walloon Region of Belgium has used a genetic evaluation system for pregnancy rate in Holsteins and has participated in 3 of the 5 MACE trait INTERBULL runs for female fertility. In order to define general way of female fertility expression, a principal component analysis was carried out on six published foreign female fertility indexes. Results of were used to compute a direct female fertility index with the INTERBULL international female fertility proofs available on the Walloon scale. An indirect female fertility index was also developed in order to increase reliability of young bulls. Approximate procedure based on selection index was used to combine both indexes in an overall index called combined female fertility index. This index was highly correlated with the direct female fertility index (.96) and the first principal component (.85), therefore it was considered as good expression of female fertility. Moreover, this allowed recovering 4,019 INTERBULL bulls with a publishable female fertility index.
Disciplines :
Animal production & animal husbandry
Genetics & genetic processes
Author, co-author :
Vanderick, Sylvie  ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Bastin, Catherine ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Gengler, Nicolas  ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Language :
English
Title :
Expressing female fertility in the Walloon region of Belgium: how to do?
Publication date :
August 2009
Event name :
The 2009 Interbull Meeting
Event place :
Barcelona, Spain
Event date :
August 21-23, 2009
Audience :
International
Additional URL :
Available on ORBi :
since 13 October 2010

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