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Foundation Animal Effects: Difference between revisions
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[[Category: Genetic Evaluation]] | [[Category: Genetic Evaluation]] | ||
Implementing [[Best Linear Unbiased Prediction | BLUP animal models]] without accounting for differences in [[Glossary#F | foundation animals']] genetic merit can result in [[Prediction_Bias | biased EPDs]]. Differences in additive genetic merit between foundation animals can be a result of different breeds of origin or entering the data used for genetic evaluation at different periods of time. The latter differences are due to genetic trend from selection. | |||
Including ''additive genetic group effects''<ref>Westell, R. A., R. L. Quaas, and L. D. Van Vleck. 1988. Genetic | Including ''additive genetic group effects''<ref>Westell, R. A., R. L. Quaas, and L. D. Van Vleck. 1988. Genetic | ||
groups in an animal model. J. Dairy Sci. 71:1310.</ref><ref>Quaas, R. L. 1988. Additive genetic model with groups and relationships. J. Dairy Sci. 71:1338. </ref> in [[Best_Linear_Unbiased_Prediction | BLUP]] animal models used to produce [[BIF_recommends_the_use_of_EPD | EPDs]] is important when the [[Glossary#F | foundation animals]] come from genetically different origins such as distinct breeds. | groups in an animal model. J. Dairy Sci. 71:1310.</ref><ref>Quaas, R. L. 1988. Additive genetic model with groups and relationships. J. Dairy Sci. 71:1338. </ref> in [[Best_Linear_Unbiased_Prediction | BLUP]] animal models used to produce [[BIF_recommends_the_use_of_EPD | EPDs]] is important when the [[Glossary#F | foundation animals]] come from genetically different origins such as distinct breeds. | ||
Revision as of 14:17, 22 June 2024
Implementing BLUP animal models without accounting for differences in foundation animals' genetic merit can result in biased EPDs. Differences in additive genetic merit between foundation animals can be a result of different breeds of origin or entering the data used for genetic evaluation at different periods of time. The latter differences are due to genetic trend from selection.
Including additive genetic group effects[1][2] in BLUP animal models used to produce EPDs is important when the foundation animals come from genetically different origins such as distinct breeds. This includes so-called multi-breed analysis and analysis of composite breed data.
Also, genetic groups should be used in BLUP models when foundation animals of the same breed enter the population at different periods of time to account for the effect of genetic trend over time. Foundation animals from distinctly different periods of time can have different genetic merit due to selection resulting in genetic trend.
All foundation animals are modeled as having the same average genetic merit when additive genetic group effects are not included. Including additive genetic groups permit the model to predict if genetic differences occured between the groups. These differences impact the descendants of the foundation animals' EPDs.
