25. Threshold Characters

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As found by Jim Fry (University of Rochester), Table 25.1 contains numerous (minor) numerical errors. pdf copy of the corrected table.

Updated Notes

Dealing simultaneously with multiple thresholds

( Posted 20 September 2000)

The following comments are from Gary Snowder (Animal Geneticist, USDA, ARS, U.S. Sheep Experiment Station, Dubois, ID 83423).

The topic of multiple thresholds only considers the approaches of Reich et al. 1972. While there is nothing incorrect with this approach there are other approaches that allow one to consider all thresholds without having to combine classification groups.

  1. W. E. Vinsen, J. M. White and R. H. Kliewer. 1976. Overall classification as a selection criterion for improving categorically scored components of type in Holsteins. J. Dairy Sci. 59:2104-2114.

  2. D. Gianola. 1979. Heritability of polychotomous characters. Genetics 93: 1051-1055.

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Created 12 May 1995, last updated 14 May 2001

Bruce Walsh. jbwalsh@u.arizona.edu . Comments welcome.