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The heritability for slaughter weight is 0.4, the population average is 875 g/d, and that of the 20 full sibs is 900 g/d. The common environmental effect for full sibs (c²) = 0.45

Step 1: the phenotypic superiority = 900 – 875 = 25 g/d

Step 2: the regression coefficient = (½* 20 * 0.4)/(1+(20-1)*( ½* 0.4 + 0.45)) = 4/13.35 = 0.30

Step 3: the EBV for average daily gain from 25 to 100 kg for this pig is 25 * 0.3 = 7.5 g/d.

Note: the regression coefficient is lower than the heritability. Reason is that full sibs perform more alike because they have shared a common environment. Therefore, a smaller proportion of the phenotypic superiority can be assigned to shared genetics than without shared common environment. This is taken into account through the c² when determining the regression coefficient for estimating the breeding value.