Page 15 - Tarangower Angus Catalogue ebook
P. 15

marketed at 530 kg live weight (290 kg carcase weight and 10 mm   See the Table BELOW.
       fat depth) at approximately 20 months of age.          As a rule, animals should be compared on EBVs regardless of
       Heifer/Dairy Terminal Index ($) – Estimates the genetic   accuracy. However, where two animals have similar EBVs the one
       differences between animals in net profitability per female joined in   with higher accuracy could be the safer choice, assuming other
       an example herd where all progeny are marketed. All progeny are   factors are equal.
       marketed at approximately 510 kg live weight (280 kg carcase weight   For further information please contact NZ Angus or TACE.
       and 7 mm fat depth) at approximately 24 months of age.
       Note that $Index values for individual animals are sensitive to the
       assumptions used in the BreedObject analysis to calculate the   ACCURACY         INTERPRETATION
       selection index.  More information is available on the weightings used   RANGE
       in the New Zealand Angus Selection Indices.                            EBV should be considered as a preliminary

       ACCURACY                                                  less than 50%  estimate. It could change substantially as more
                                                                              performance information becomes available.
       Accuracy (%) is based on the amount of performance information         Medium accuracy, usually based on the animal’s
       available on the animal and its close relatives - particularly the     own records and pedigree. Still subject to
       number of progeny analysed.  Accuracy is also based on the   50-74%    substantial changes with more information,
       heritability of the trait and the genetic correlations with other      particularly when the performance of progeny
       recorded traits.  Hence accuracy indicates the “confidence level” of   are analysed.
       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   75-90%  Medium - high accuracy and includes some
                                                                              progeny information. Becoming a more reliable
       animal or its relatives.  Even though an EBV with a low accuracy may   indicator of the animal’s value as a parent.
       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   High accuracy estimate of the animal’s true
       is just as likely to increase in value, as it is to decrease.  more than 90%  breeding value. It is unlikely that the EBV will
                                                                              change much with the addition of more progeny
       Accuracy values range from 0-99%.  The following guide is given for    data.
       interpreting accuracy:
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