MCMCglmm with datasets of different lengths

I started with one dataset with four traits (trait1, trait2, trait3 and 
trait4) measured in males and females from 30 families.

[...]

This is fine. However, I have additional data that I'd like to use to 
fit a more complicated model if possible. I have size data for males and 
females from these families, but these data are not from the same 
individuals as the original data.

Generally, as long as you have the relationships of individuals between 
the two sets, then the model should be identified (eg estimate genetic 
correlation between traits expressed only in males and females).  So maybe 
try the five trait model directly..

Just 2c, 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