The problem of estimating genetic correlations between resistance to diseases and production traits is considered. Often, only binary observations whether or not an animal has suffered a certain disease are available. An estimation procedure accounting for this discrete observation structure was suggested by Simianer and Schaeffer (1989). Problems due to restrictions in the methodology as well as to disturbances in the observed data are adressed. The impact of pleiotropy or linkage of major loci causing correlations between resistance and production traits is discussed.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIII. Plenary lectures, molecular genetics and mapping, selection, prediction and estimation., , 500–503, 1990
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