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Summarising, it is possible to get a good approximation of the genetic improvement across generations when EBV are estimated with high accuracy and using BLUP. The realised genetic improvement or realised genetic response can be determined by taking the difference between the average EBV in both generations.
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Realised response to selection = average EBVgeneration t+1 – average EBVgeneration t |
This simple formula will give the best possible approximation of the realised genetic response. Remember that the predicted genetic response is calculated as
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The difference between the realised and predicted response is what requires evaluation. The smaller the difference, the better the realisation resembles the prediction, and the less evaluation is required. However, if the difference is substantial, it is essential to find out what causes it.
Thus:
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Realised genetic improvement can be determined by taking the difference in average EBV, for example between generations |