Estimation by results of selection

The heritability is

h2 = SE/SD

where

SR = selection response

SD = selection differential

Estimation by using regression

y = a +b x

where

y = progeny performance,

x = parental performance

b = regression

a = constant

When performances of both parents are kown then x is the mean of sire’s and dam’s performance

h2 = b

When performance of only one parets is known then

h2 = 2b

Estimation by correlation

• Correlation of full-sibs, half-sibs can be used. Also square of correlation between genetic value
• (Breeding value) and phenotypic value is heritability.