Genetic grops

From: Ericsson Tore <Tore.Ericsson_at_SKOGFORSK.SE>
Date: Thu, 21 Sep 2006 15:23:01 +0200

Regarding computation of "real" breeding values when using an individual
(tree) model with genetic groups

Model: y ~ block !r genid

In the sln file, I identify

Block effects: 0, b2, b3, b4, b5 (blue for five blocks, a singularity
due to groups)

Group effects: g1, g2, g3, g4 (four genetic groups)

Individual breeding values (BVs): One for each tree in the data file (or
in the pedigree file)

Problem: How should I compare and/or combine the mean of (1) BVs, (2)
group effects, and (3) block effects?

I assume that the group effects are included in the BVs, and that the
group effects represent the group means in some way.

The averages of BVs and group effects, respectively, do not agree very
well for me. Also, adjusting either of them with tha mean of the block
effects (zero included) makes it still worse.

Question: How should I best combine these effects to get values that are
adequate for computation of relative breeding values?

Best regards
Tore Ericsson
Received on Tue Sep 21 2006 - 15:23:01 EST

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