Page 15 - Tarangower Angus Catalogue ebook

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: