Hi Bruce
>
> Hi,
> I need some help with specifying variance components under a multivariate
> model with maternal effects. The data set does not have sufficient
> information to estimate the additive-maternal covariance. So I am just
> fitting dam as a second effect.
>
> Below is a my current .as file (simplified as the random effects are the
> important part at present), is this a correct specification?
> Is this the same as saying:
> wt0 wtw ~ Trait !r Tr.tag at(Tr,1).dam at(Tr,2).dam ?
YES well same as
wt0 wtw ~ Trait !r Tr.tag at(Tr,1).dam 0.2 at(Tr,2).dam 4.2
and omitting the last G structure
>
> If I decide to fit only a maternal effect to wt0, the model changes to:
> wt0 wtw ~ Trait !r Tr.tag at(Tr,1).dam
wt0 wtw ~ Trait !r Tr.tag at(Tr,1).dam 0.2
>
> How would I specify starting variance components for the dam component?
>
>
> Thanks in advance for any comments,
> Bruce Southey
>
>
>
Best wishes
Arthur
> Bivariate with maternal
> tag !p # 2525 animals in pedigree
> sire
> dam !p
> br 6 !I
> yb 6 !I
> sx 2 !I
> aod 4 !I
> bd !-12260
> aw
> ped.file
> wt.dat !MAXIT 1 # !CONTINUE
> wt0 wtw ~ Trait !r Tr.tag Tr.dam
> 1 2 2 # !step 0.0001
> 0 0 0
> Trait 0 US 0.29202 0.63988 3.0156
> Tr.tag 2
> Trait 0 US 0.28609 0.85243 4.6901
> tag 0 0
> Tr.dam 2
> 2 0 DIAG 0.2 4.2
> dam 0 0
>
>
>
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Arthur Gilmour PhD mailto:Arthur.Gilmour@agric.nsw.gov.au
Senior Research Scientist (Biometrics) fax: <61> 2 6391 3899
NSW Agriculture <61> 2 6391 3922
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