[R-sig-ME] animal model: calculating heritability andevolvability from sire effects

[mikhail matz]

Hello David - 

On Dec 28, 2011, at 4:15 PM, David Duffy wrote:
> So you know the trait values for both parents? so you can do a midparent regression?  And you don't or can't measure the within-sibship variance?

No, I cannot do midparent regression, unfortunately (this would be SO awesome). I am measuring larval traits, and I cannot measure those in wild-collected adult corals that serve as parents. I cannot measure within-family variance, either - only whole-family averages by measuring batches of larvae (the larvae are too small for most measurements). Please keep those ideas coming....

Misha

> On Wed, 28 Dec 2011, mikhail matz wrote:
> 
>> Hello Paul -
>> 
>> the problem is, I am not sure that the built-in "animal" modeling in MCMCglmm fits my case. I am not measuring values of my traits in individual animals. Instead, I am measuring averages for full-sib families (coral larvae are quite small, so I am measuring them in batches). Even though I can build a pedigree for my families, denoting each full-sib family as an "animal", this would not be correct since, for example, "half-sibs" (in my case, crosses sharing one parent) would share 1/2 of the genes, not 1/4 as would be the case for individual half-sib measurements. Does it make sense?...
>> 
> 
> 
> 
> Cheers, David Duffy.
> 
> -- 
> | David Duffy (MBBS PhD)                                         ,-_|\
> | email: davidD at qimr.edu.au  ph: INT+61+7+3362-0217 fax: -0101  /     *
> | Epidemiology Unit, Queensland Institute of Medical Research   \_,-._/
> | 300 Herston Rd, Brisbane, Queensland 4029, Australia  GPG 4D0B994A v