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Publication Information

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Title: Common families across test series—how many do we need?

Author: Johnson, G.R.;

Date: 2004

Source: Forest Genetics. 11(2): 103-112

Publication Series: Scientific Journal (JRNL)

Description: In order to compare families that are planted on different sites, many forest tree breeding programs include common families in their different series of trials. Computer simulation was used to examine how many common families were needed in each series of progeny trials in order to reliably compare families across series. Average gain and its associated variation stabilized after the addition of four to six common families.

Keywords: progeny testing, common seed lots, connectedness

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.



Johnson, G.R. 2004. Common families across test series—how many do we need?. Forest Genetics. 11(2): 103-112


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