Effect of auxiliary traits on estimation of heritablility of stayability
2002
Paul,A.K. | Bhatia, V.K. (Indian Agricultural Statistics Research Institute, New Delhi (India))
Stayability being a binary trait in animal breeding thorough genetic analysis. For a true measure of stayability this need to be adjusted for various production and reproductive traits. For estimation of heritability of stayability this adjusted herdlife for production is converted to binary trait using threshold probability. The exhaustive methodology for threshold characters has been outlined by Falconer and Mackey [3]. The procedure of beta-bionomial Paul and Bhatia [6] and Dempster-Lerner [2] methods have been used to estimate the heritability of stayability in unbalanced data sets. It is seen that even small adjustment on account of production has a great effect on estimates with large standard error. Further relative root mean square errors are also obtainedand found that precision as well as accuracy of estimates are affected by adjustment of production. The results of modified beta-binomial method of estimation show some what consistency whereas for other procedured, no specific trend is seen for adjustment of data for production.
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