Parameter

Crossbred

Purebred simulations


Mean

SD


Genetic variance

0.067

0.14

0.015

Genetic correlation for eggshell color

0.86

0.93

0.018

Genetic correlation for environmental variance different definitions^{a}

0.70

0.73

0.10

Genetic correlation for environmental variance equal definition^{b}

0.95

1.00

–

 Comparison of 20 replicates (mean and standard deviation) between purebreds and crossbreds

^{a}For purebreds, in individual cages, the environmental variance contains only withinindividual variance, whereas the environmental variance in multiplehen cages (also crossbreds) contains withinindividual variance and betweenindividual variance, i.e. different definitions of environmental variance

^{b}Here the interest lies in the genetic correlation between individual variance in purebred and crossbred laying hens, i.e. equal definition of environmental variance. Therefore, the expected genetic correlation in the purebred simulations is 1.00. Based on this assumption, Eq. 17 can be used to calculate the estimated genetic correlation between withinindividual variance in purebred and crossbred laying hens