Page 8 - Ranui Angus 2021 ebook
P. 8


       Accuracy (%) is based on the amount of performance information available on the animal and its close
       relatives - particularly the number of progeny analysed.  Accuracy is also based on the heritability of the
       trait and the genetic correlations with other recorded traits.  Hence accuracy indicates the “confidence
       level” of the EBV.  The higher the accuracy value the lower the likelihood of change in the animal’s EBV as
       more information is analysed for that animal or its relatives.  Even though an EBV with a low accuracy may
       change in the future, it is still the best estimate of an animal’s genetic merit for that trait.  As more information
       becomes available, an EBV is just as likely to increase in value, as it is to decrease.
       Accuracy values range from 0-99%.  The following guide is given for interpreting accuracy:
       Accuracy range  Interpretation
                      EBV should be considered as a preliminary estimate.  It could change substantially
         Less than 50%
                      as more performance information becomes available.
                      Medium accuracy, usually based on the animal’s own records and pedigree.
           50-74%     Still subject to substantial changes with more information, particularly when the
                      performance of progeny are analysed.
                      Medium - high accuracy and includes some progeny information.  Becoming a more
                      reliable indicator of the animal’s value as a parent.
                      High accuracy estimate of the animal’s true breeding value.  It is unlikely that the EBV
         More than 90%
                      will change much with the addition of more progeny data.

       As a rule, animals should be compared on EBVs regardless of accuracy.  However, where two animals have
       similar EBVs the one with higher accuracy could be the safer choice, assuming other factors are equal.
       For further information please contact NZ Angus or TACE.

                            WANGANUI VETERINARY


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