Report - Selection on an Index of Traits I= X b j z j =b T z æ 2 I =æ(b T z;b T z)=b T æ(z;z)b=b T Pbæ 2 A I =æ A (b T z;b T z)=b T æ A (z;z)b=b T Gb h 2 I = æ.

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