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Effect of Some Controllable Errors on Estimates of Genetic Parameters, with Special Reference to Early Post-Natal Growth in Merino Sheep

Glebe, N.S.W., Australia

Abstract

In this paper the effect of some controllable errors on the estimation of heritability and genetic correlation is investigated. It is concluded that, although these controllable errors generally do not bias estimates of genetic correlation, heritability estimates may sustain a severe negative bias. Controllable errors also tend to inflate the sampling variances of estimates of genetic correlation. These findings are illustrated numerically for the two characters birth weight and weaning weight in Merino sheep.

¹ Division of Animal Genetics, C.S.I.R.O., McMaster Laboratory.

² Some data used in the example were obtained from records of experimental sheep maintained at the National Field Station, "Gilruth Plains", Cunnamulla, N.S.W.