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http://dx.doi.org/10.5713/ajas.2002.1222

On the Negative Estimates of Direct and Maternal Genetic Correlation - A Review  

Lee, C. (Laboratory of Statistical Genetics, Institute of Environment and Life Science, Hallym University)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.15, no.8, 2002 , pp. 1222-1226 More about this Journal
Abstract
Estimates of genetic correlation between direct and maternal effects for weaning weight of beef cattle are often negative in field data. The biological existence of this genetic antagonism has been the point at issue. Some researchers perceived such negative estimate to be an artifact from poor modeling. Recent studies on sources affecting the genetic correlation estimates are reviewed in this article. They focus on heterogeneity of the correlation by sex, selection bias caused from selective reporting, selection bias caused from splitting data by sex, sire by year interaction variance, and sire misidentification and inbreeding depression as factors contributing sire by year interaction variance. A biological justification of the genetic antagonism is also discussed. It is proposed to include the direct-maternal genetic covariance in the analytical models.
Keywords
Maternal Effects; Parameter Estimation; Variance Component; Weaning Weight;
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