Page 11 - Puke-Nui Angus Catalogue eBook.pdf

calves. A negative EBV for days to calving indicates a shorter interval from percentage of intramuscular fat at the 12/13th rib site in a 400 kg carcase.
bull-in date to calving and therefore higher fertility. Depending on market targets, larger more positive values are generally
Carcase Weight EBV (kg) is based on abattoir carcase records and is an more favourable.
indicator of the genetic differences in carcase weight at the standard age Docility EBV (%) is an estimate of the genetic differences between
of 750 days. animals in temperament. Docility EBVs are expressed as differences
Eye Muscle Area EBV (sq cm) is calculated from measurements from in the percentage of progeny that will be scored with acceptable
live animal ultrasound scans and from abattoir carcase data, adjusted to temperament (ie. either “docile” or “restless”).
a standard 400 kg carcase. This EBV estimates genetic differences in eye ACCURACY
muscle area at the 12/13th rib site of a 400 kg dressed carcase. More
positive EBVs indicate better muscling on animals. Sires with relatively Accuracy (%) is based on the amount of performance information
higher EMA EBVs are expected to produce better-muscled and higher available on the animal and its close relatives - particularly the number of
percentage yielding progeny at the same carcase weight than will sires progeny analysed. Accuracy is also based on the heritability of the trait
with lower EMA EBVs. and the genetic correlations with other recorded traits. Hence accuracy
indicates the “confidence level” of the EBV. The higher the accuracy
Rib Fat and Rump Fat EBVs (mm) are calculated from measurements of value the lower the likelihood of change in the animal’s EBV as more
subcutaneous fat depth at the 12/13-rib site and the P8 rump site (from information is analysed for that animal or its relatives. Even though
live animal ultrasound scans and from abattoir carcases) and are adjusted an EBV with a low accuracy may change in the future, it is still the best
to a standard 400 kg carcase. These EBVs are indicators of the genetic estimate of an animal’s genetic merit for that trait. As more information
differences in fat distribution on a standard 400 kg carcase. Sires with becomes available, an EBV is just as likely to increase in value, as it is to
low, or negative, fat EBVs are expected to produce leaner progeny at any decrease.
particular carcase weight than will sires with higher EBVs. Accuracy values range from 0-99%. The following guide is given for
Retail Beef Yield EBV (%) indicates genetic differences between animals interpreting accuracy:
for retail yield percentage in a standard 400 kg carcase. Sires with larger
EBVs are expected to produce progeny with higher yielding carcases.
Intramuscular Fat EBV (%) is an estimate of the genetic difference in the
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