Page 12 - Sudeley Angus ebook

ACCURACY
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 as
Less than 50%
more performance information becomes
available.
Medium accuracy, usually based on the ani-
mal’s own records and pedigree. Still subject
50-74% to substantial changes with more informa-
tion, particularly when the performance of
progeny are analysed.
Medium - high accuracy and includes some
progeny information. Becoming a more
75-90%
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.
2021 TACE EBV AVERAGES
FOR ALL ANIMALS BORN IN 2019
DIR DTRS GL BW 200D 400D 600D MCW MILK
+1.5 +1.2 -4.1 +4.1 +41 +76 +98 +88 +14
SS DTC CWT EMA RIB RUMP RBY IMF
+1.7 -3.7 +49 +4.1 +0.5 +0.4 +0.2 +1.0
INDEX ($)
SR +$105 AP +$105 HDT +$99

12 SUDELEY GENETICS SHEEP & CATTLE COMPANY