Figure 2.

Reduction in the intraclass correlation coefficient due to variance arising from the relative nature of fertilization success. The figure shows the intraclass correlation coefficient for sperm competitive ability (s₂) and the associated coefficient when sperm competitive ability is estimated using fertilization success values (F₂). Each line pertains to a single sib analysis (involving 50 sires and 8 offspring per sire). Only a random subsample of 100 sib analyses is shown. Sperm competitive ability values were extracted from the distribution S (A) or Snormal (B).