radio or variance component for random effect?

Dear friends:

 I know from the userguide that the initial value (variance component or ratio) can be specified after the model term. I use the the following asreml file to estimate the predictions of random additive genetic effects (breeding value) . The number of 0.2628 and 0.0116 are the ratios (relative to the residual variance), respectively.
  My question is that Asreml how to know these numbers are the ratios, but not the variance components?

Growth traits for chinese shrimp
 animal !P
 sire !P
 dam !P
 familynum 70 !I
 tank 3
 sex 2 !I
 days
 lg
 wt
 meanwt
wt2007.ped !MAKE
wt200712fullsib.txt !SKIP 1 !MAXIT 1

wt ~ mu tank sex days !r animal 0.2628 ide(dam) 0.0116

   Yours sincerely,

   luan sheng
   ----------------------------------------
   Yellow Sea Fisheries Research Institute
   Chinese Academy of Fisheries Sciences
   Nanjing Road 106
   Qingdao 266071
   China
   luansheng_at_gmail.com
   luansheng_at_ysfri.ac.cn
   ----------------------------------------
Received on Wed Oct 27 2007 - 22:07:33 EST