Page 10 - Kaingaroa Simmentals Catalogue ebook

Note that $Index Values for individual animals are sensitive to the assumptions used in
the BreedObject analysis to calculate the relevant selection index.
Selection Indexes
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
Low accuracy. EBVs are preliminary and could change substantially
less than 50%
as more performance information becomes available.
Medium accuracy, usually based on the animal’s own records
50-74%
and pedigree.
Medium-high accuracy. Some progeny information included.
75-90%
EBVs may change with addition of more progeny data.
more than 90% High accuracy estimate of the animal’s true breeding value.

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 the New Zealand Simmental Association.

2021 SIMMENTAL TRANSTASMAN BREEDPLAN
CE CED GL BW 200D 400D 600D MCWt Milk
+2.3 +1.2 -1.4 +0.7 +20 +36 +45 +45 +8
SS DC CWt EMA Rib RUMP RBY IMF Docility
+0.5 -1.5 +25 +2.5 +0.4 +0.2 +0.5 +0.3 +8
INDEXES Maternal Index +$83 Terminal Index +$43

8 • Kaingaroa Simmentals