Reference : Expressing female fertility in the Walloon region of Belgium: how to do?
Scientific journals : Article
Life sciences : Genetics & genetic processes
Life sciences : Animal production & animal husbandry
http://hdl.handle.net/2268/20738
Expressing female fertility in the Walloon region of Belgium: how to do?
English
Vanderick, Sylvie mailto [Université de Liège - ULg > Sciences agronomiques > Zootechnie >]
Bastin, Catherine mailto [Université de Liège - ULg > Sciences agronomiques > Zootechnie >]
Gengler, Nicolas mailto [Université de Liège - ULg > Sciences agronomiques > Zootechnie >]
2009
Interbull Bulletin
40
10-16
No
International
1011-6079
[en] Female fertility ; pregnancy rate ; correlations
[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.
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/20738
http://www.interbull.org/

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