Page 11 - Dandaleith Angus Sale 2021 ebook

weighed for weaning, adjusted to 5 years of age. This EBV is an estimate Eye Muscle Area EBV (sq cm) is calculated from measurements from live
of the genetic difference in cow weight at 5 years of age and is an indicator animal ultrasound scans and from abattoir carcase data, adjusted to a
of growth at later ages and potential feed maintenance requirements of the standard 400 kg carcase. This EBV estimates genetic differences in eye
females in the breeding herd. Steer breeders wishing to grow animals out muscle area at the 12/13th rib site of a 400 kg dressed carcase. More
to a larger weight may also use the Mature Cow Weight EBV. positive EBVs indicate better muscling on animals. Sires with relatively
Milk EBV (kg) is an estimate of an animal’s milking ability. For sires, this higher EMA EBVs are expected to produce better-muscled and higher
EBV indicates the effect of the daughter’s milking ability, inherited from percentage yielding progeny at the same carcase weight than will sires with
the sire, on the 200-day weights of her calves. For dams, it indicates her lower EMA EBVs.
milking ability. Rib Fat and Rump Fat EBVs (mm) are calculated from measurements of
Scrotal Size EBV (cm) is calculated from the circumference of the scrotum subcutaneous fat depth at the 12/13-rib site and the P8 rump site (from
taken between 300 and 700 days of age and adjusted to 400 days of age. live animal ultrasound scans and from abattoir carcases) and are adjusted
This EBV is an estimate of an animal’s genetic merit for scrotal size. There to a standard 400 kg carcase. These EBVs are indicators of the genetic
is also a small negative correlation with age of puberty in female progeny differences in fat distribution on a standard 400 kg carcase. Sires with
and therefore selection for increased scrotal size will result in reduced age low, or negative, fat EBVs are expected to produce leaner progeny at any
at calving of female progeny. particular carcase weight than will sires with higher EBVs.
Days to Calving EBV (days) indicates the fertility of the daughters of Retail Beef Yield EBV (%) indicates genetic differences between animals for
the sire. It is the time interval between the day when the female is first retail yield percentage in a standard 400 kg carcase. Sires with larger EBVs
exposed to a bull in a paddock mating to the day when she subsequently are expected to produce progeny with higher yielding carcases.
calves. A negative EBV for days to calving indicates a shorter interval from Intramuscular Fat EBV (%) is an estimate of the genetic difference in the
bull-in date to calving and therefore higher fertility. percentage of intramuscular fat at the 12/13th rib site in a 400 kg carcase.
Carcase Weight EBV (kg) is based on abattoir carcase records and is an Depending on market targets, larger more positive values are generally
indicator of the genetic differences in carcase weight at the standard age of more favourable.
750 days. Docility EBV (%) is an estimate of the genetic differences between
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