Page 14 - Turiroa Angus Sale 2021 ebook

AngusPure Index ($) – Estimates genetic differences between animals an animal’s genetic merit for that trait. As more information becomes
in net profitability per cow joined for a self-replacing commercial Angus available, an EBV is just as likely to increase in value, as it is to decrease.
herd, targeting the production of grass finished steers for the AngusPure Accuracy values range from 0-99%. The following guide is given for
programme. Steers are assumed marketed at 525 kg live weight (280 interpreting accuracy:
kg carcase weight and 10 mm fat depth) at 18 months of age with a
significant premium paid for marbling. See the Table BELOW.
Heifer/Dairy Terminal Index ($) – Estimates the genetic differences ACC RANGE INTERPRETATION
between animals in net profitability per female joined in an example
herd where all progeny are marketed. All progeny are marketed at less than 50% EBV should be considered as a preliminary estimate. It could change
approximately 510 kg live weight (280 kg carcase weight and 7 mm fat substantially as more performance information becomes available.
depth) at approximately 24 months of age. Medium accuracy, usually based on the animal’s own records and
Note that $Index values for individual animals are sensitive to the 50-74% pedigree. Still subject to substantial changes with more information,
assumptions used in the BreedObject analysis to calculate the selection particularly when the performance of progeny are analysed.
index. More information is available on the weightings used in the New
Zealand Angus Selection Indexes. 75-90% Medium - high accuracy and includes some progeny information.
ACCURACY Becoming a more reliable indicator of the animal’s value as a parent.
Accuracy (%) is based on the amount of performance information High accuracy estimate of the animal’s true breeding value. It is
available on the animal and its close relatives - particularly the number of more than 90% unlikely that the EBV will change much with the addition of more
progeny analysed. Accuracy is also based on the heritability of the trait progeny data.
and the genetic correlations with other recorded traits. Hence accuracy
indicates the “confidence level” of the EBV. The higher the accuracy value As a rule, animals should be compared on EBVs regardless of accuracy.
the lower the likelihood of change in the animal’s EBV as more information However, where two animals have similar EBVs the one with higher accuracy
is analysed for that animal or its relatives. Even though an EBV with could be the safer choice, assuming other factors are equal. For further
a low accuracy may change in the future, it is still the best estimate of information please contact NZ Angus or TACE.