The response to selection yields an estimate of heritability (h2) in the limited sense. The variance of this estimate ([delta] 2h2) is divided into two components: (1) one due to the limited number of offspring (No) raised and (2) a component due to the limited number of parents (Np) selected to produce the offspring. Both components are taken info account in the derivation of the following expression for the variance of the estimate of h2:[delta]2h2=[delta]2[image]where [delta]2 is the total phenotypic variance.