Consequences of selection for milk quality and robustness traits

in Interbull Bulletin (2012), 44

Is It Possible to Define a European Total Merit Index?

in Interbull Bulletin (2012), 44

Developing a common European bull list is an objective of the PROTEJE (PROduction Traits European Joint Evaluation) workgroup started in 2001 as an initiative of the European Holstein herdbooks. Six Total ... [more ▼]

Developing a common European bull list is an objective of the PROTEJE (PROduction Traits European Joint Evaluation) workgroup started in 2001 as an initiative of the European Holstein herdbooks. Six Total Merit Indexes were compared to define a common breeding goal across Europe. A principal component analysis was used to observe the direction of the largest common variation among the studied Total Merit Indexes. Results showed that the considered indexes had a lot in common. The first principal component explained 86% of the total variation. Based on previous researches establishing combined proofs on a European phantom scale for most traits and trait groups and using a multiple regression for this European Total Merit Index, relative emphases on production and functionality of 37% and on conformation of 26% could be established. [less ▲]

Genetic evaluation for body condition score in the Walloon region of Belgium

in Interbull Bulletin (2010), 42

Genetic Evaluation for Milk Fat Composition in the Walloon Region of Belgium

in Interbull Bulletin (2010), 42

Expressing female fertility in the Walloon region of Belgium: how to do?

in Interbull Bulletin (2009), 40

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 ... [more ▼]

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. [less ▲]

Bayesian approach to integrate molecular data into genetic evaluations

in Interbull Bulletin (2007), 37

Genetic Parameters of Butter Hardness Estimated by Test-Day Model

in Interbull Bulletin (2007), 37

Genetic evaluation of female fertility for Walloon dairy and dual purpose cows using a parity random regression model: first results

in INTERBULL Bulletin (2006), 34

Investigation on genotype by environment interaction for milk yield of Holstein cows in Luxembourg and Tunisia

in INTERBULL Bulletin (2006), 35

Inbreeding depression for global and partial economic indexes, production, type and functional traits in the Walloon Region of Belgium

in INTERBULL Bulletin (2005), 33