Proportions of the four possible kinds of relatives in the 23 OP families harvested in FP.620. Self full-sibs (Sfs) were only seen in families FV10, FV15 and FV22 (range 0.31 to 0.40%). Based on these proportions the average genetic correlation in each OP family was calculated and is shown on top of each bar. The bar on the right side of the diagram shows the average distribution and genetic correlation (0.29) for all 23 families in the CSO. Average size of OP-family: 25.9 offspring. Range: 22 to 28 offspring.