[vsni.co.uk] Contact us
Author Message
Post new topic

  ASReml  ~  Estimating heritability from fa model

heping.zhang@csiro.au
Posted: Mon Nov 19, 2018 9:12 am Reply with quote
Joined: 09 Aug 2016 Posts: 3
I use the following asreml models to evaluate genotype and environment interaction in canola.
diag.asr <- asreml(yield ~ env, random = ~ diag(env):Variety+at(env):Rep/HT,
rcov = ~at(env):Variety:Rep, na.method.X="include", data = mydata, maxiter=50)
fa1.asr<- update(diag.asr, random=~fa(env,1):Variety+at(env):Rep/HT)
fa2.asr<- update(fa1.asr, random=~Variety:fa(env,2)+at(env):Rep/HT)
I want to calculate heritability of variety across the environments. I use Cullis et al. (2006) formula (h2=1-att/(2σv^2) to calculate the heritability.

I can extract variety variance for individual environments from the diagonal elements of the variance matrix. However, when I calculate the heritability, I need only one genetic variance. In this case, how can I calculate the genetic variance from the variances of different environments?

Your suggestion will be appreciated very much.

Heping Zhang
View user's profile Send private message

Display posts from previous:  

All times are GMT
Page 1 of 1
Post new topic

Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum