Page 9 - Grampians Angus 2021 Catalogue ebook

Scrotal Size EBV (cm) is calculated from the circumference of the
scrotum taken between 300 and 700 days of age and adjusted
to 400 days of age. This EBV is an estimate of an animal’s genetic
merit for scrotal size. There is also a small negative correlation
with age of puberty in female progeny and therefore selection
for increased scrotal size will result in reduced age at calving of
female progeny.
Days to Calving EBV (days) indicates the fertility of the daughters
of the sire. It is the time interval between the day when the female
is first exposed to a bull in a paddock mating to the day when she
subsequently calves. A negative EBV for days to calving indicates
a shorter interval from bull-in date to calving and therefore higher
fertility.
Carcase Weight EBV (kg) is based on abattoir carcase records
and is an indicator of the genetic differences in carcase weight at
the standard age of 750 days.
Eye Muscle Area EBV (sq cm) is calculated from measurements
from live animal ultrasound scans and from abattoir carcase
data, adjusted to a standard 400 kg carcase. This EBV estimates
genetic differences in eye 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 higher EMA EBVs are
expected to produce better-muscled and higher percentage
yielding progeny at the same carcase weight than will sires with
lower EMA EBVs.
Rib Fat and Rump Fat EBVs (mm) are calculated from
measurements of subcutaneous fat depth at the 12/13-rib site
and the P8 rump site (from live animal ultrasound scans and
from abattoir carcases) and are adjusted to a standard 400 kg
carcase. These EBVs are indicators of the genetic differences in
fat distribution on a standard 400 kg carcase. Sires with low, or
negative, fat EBVs are expected to produce leaner progeny at any
particular carcase weight than will sires with higher EBVs.
Retail Beef Yield EBV (%) indicates genetic differences between
animals 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 percentage of intramuscular fat at the 12/13th
rib site in a 400 kg carcase. Depending on market targets, larger
more positive values are generally more favourable.
Docility EBV (%) is an estimate of the genetic differences
between animals in temperament. Docility EBVs are expressed
as differences in the percentage of progeny that will be scored
with acceptable temperament (ie. either “docile” or “restless”)

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