Calving Ease EBVs (%) are based on calving difficulty
scores, birth weights and gestation length information.
More positive EBVs are favourable and indicate easier
CE % Dir = Direct Calving Ease - The EBV for direct
calving ease indicates the influence of the sire on
calving ease in purebred females calving at two years
CE % Daughters = Daughter's Calving Ease - The EBV
for daughters' calving ease indicates how easily that
sire's daughters will calve at two years of age.
Length (days) is an estimate of the time from conception
to the birth of the calf and is based on AI records.
Lower (negative) GL EBVs indicate shorter gestation
length and therefore easier calving and increased growth
Weight EBV (kg) is based on the measured birth weight
of progeny, adjusted for dam age. The lower the value
the lighter the calf at birth and the lower the likelihood
of a difficult birth. This is particularly important
when selecting sires for use over heifers.
Day Growth EBV (kg) is calculated from the weight
of progeny taken between 80 and 300 days of age. Values
are adjusted to 200 days and for age of dam. This EBV
is the best single estimate of an animal's genetic merit
for growth to early ages.
Weight EBV (kg) is calculated from the weight of
progeny taken between 301 and 500 days of age, adjusted
to 400 days and for age of dam. This EBV is the best
single estimate of an animal's genetic merit for yearling
Weight EBV (kg) is calculated from the weight of
progeny taken between 501 and 900 days of age, adjusted
to 600 days and for age of dam. This EBV is the best
single estimate of an animal's genetic merit for growth
beyond yearling age.
Cow Weight EBV (kg) is based on the cow weight when
the calf is weighed for weaning, adjusted to 5 years
of age. This EBV is an estimate of the genetic difference
in cow weight at 5 years of age and is an indicator
of growth at later ages and potential feed maintenance
requirements of the females in the breeding herd. Smaller,
or more moderate EBVs are generally more favourable.
The Mature Cow Weight EBV may also be used by steer
breeders wishing to grow animals out to a larger weight.
EBV (kg) is an estimate of an animal's milking ability.
For sires, this EBV indicates the effect of the daughter's
milking ability, inherited from the sire, on the 200
and 400 day weights of her calves. For dams, it indicates
her own milking ability.
Size EBV (cm) is calculated from the circumference
of the scrotum, measured in centimetres and adjusted
to 400 days of age. This EBV is an estimate of a sire's
genetic merit for scrotal size and is positively correlated
to age of puberty in female progeny.
to Calving (days) - This EBV indicates the fertility
of the daughters of the sire. It is the time interval
between the date 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.
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 650 days.
Muscle Area EBV (sq cm) is calculated from measurements
from live animal ultrasound scans and from abattoir
carcase data, adjusted to a standard 300 kg carcase.
This EBV estimates genetic differences in eye muscle
area at the 12/13th rib site of a 300 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.
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
300 kg carcase. These EBVs are indicators of the genetic
differences in fat distribution on a standard 300 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.
Beef Yield EBV (%) indicates genetic differences
between animals for retail yield percentage in a standard
300 kg carcase. Sires with larger EBVs are expected
to produce progeny with higher yielding carcases.
Fat EBV (%) is an estimate of the genetic difference
in the percentage of intra-muscular fat at the 12/13th
rib site in a 300kg carcase. Depending on market targets,
larger more positive values are generally more favourable.
(%) 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. Accuracy
ranges from 0-99% and indicates the probability of an
EBV changing with the addition of more progeny data.
The magnitude of possible change decreases as accuracy
increases. Accuracy below 75% should be regarded as
low, between 76-90% as medium and above 90% as high.
accuracy value is reported with every EBV.