Page 8 - Waiterenui Angus Sale 2021 ebook

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DAYS TO CALVING EBV (days) indicates the fertility of the daughters RETAIL BEEF YIELD EBV (%) indicates genetic differences between
of the sire. It is the time interval between the day when the female animals for retail yield percentage in a standard 400 kg carcase.
is first exposed to a bull in a paddock mating to the day when she Sires with larger EBVs are expected to produce progeny with higher
subsequently calves. A negative EBV for days to calving indicates a yielding carcases.
shorter interval from bull-in date to calving and therefore higher INTRAMUSCULAR FAT EBV (%) is an estimate of the genetic
fertility. difference in the percentage of intramuscular fat at the 12/13th rib
CARCASE WEIGHT EBV (kg) is based on abattoir carcase records site in a 400 kg carcase. Depending on market targets, larger more
and is an indicator of the genetic differences in carcase weight at positive values are generally more favourable.
the standard age of 750 days. DOCILITY EBV (%) is an estimate of the genetic differences between
EYE MUSCLE AREA EBV (sq cm) is calculated from measurements animals in temperament. Docility EBVs are expressed as differences
from live animal ultrasound scans and from abattoir carcase data, in the percentage of progeny that will be scored with acceptable
adjusted to a standard 400 kg carcase. This EBV estimates genetic temperament (ie. either “docile” or “restless”).
differences in eye muscle area at the 12/13th rib site of a 400 kg SELECTION INDEXES
dressed carcase. More positive EBVs indicate better muscling on
animals. Sires with relatively higher EMA EBVs are expected to There are currently three selection indexes calculated for New
produce better-muscled and higher percentage yielding progeny Zealand Angus animals. These are Self-Replacing, AngusPure and
at the same carcase weight than will sires with lower EMA EBVs. Heifer/Dairy Terminal. Each selection index describes a different
production/market scenario and relates to a typical commercial
RIB FAT AND RUMP FAT EBVS (mm) are calculated from herd in New Zealand that is targeting the following specifications.
measurements of subcutaneous fat depth at the 12/13-rib site
and the P8 rump site (from live animal ultrasound scans and Index values are reported as EBVs, in units of relative earning
from abattoir carcases) and are adjusted to a standard 400 kg capacity ($’s) for a given market. They reflect both the short-term
carcase. These EBVs are indicators of the genetic differences in fat profit generated by a sire through the sale of his progeny, and the
distribution on a standard 400 kg carcase. Sires with low, or negative, longer-term profit generated by his daughters in a self-replacing
fat EBVs are expected to produce leaner progeny at any particular cow herd. More information is available on selecting animals using
carcase weight than will sires with higher EBVs. a selection index.

P age 6 | W aiterenui Angus | Passion Per formance Profit