Page 9 - Capethorne Riverland Grassmere ebook

CE % Daughters = Daughters’ Calving Ease - The EBV for daughters’
calving ease indicates how easily that sire’s daughters will calve at two years
of age.
Gestation Length EBV (days) is an estimate of the time from conception
to the birth of the calf and is based on AI and hand mating records. Lower
(negative) GL EBVs indicate shorter gestation length and therefore easier
calving and increased growth after birth.
Birth 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.
200-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.
400-Day 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.
600-Day 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.
Mature 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. Steer breeders wishing to grow animals out to
a larger weight may also use the Mature Cow Weight EBV.
Milk 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-day weights of her calves. For dams, it indicates her milking
ability.
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.

Riverlands, Capethorne, Grassmere Combined Bull Sale 2021 7