Page 14 - Tarangower Angus Catalogue ebook
P. 14

Carcase Weight EBV (kg) is based on abattoir carcase   Docility EBV (%) is an estimate of the genetic differences
       records and is an indicator of the genetic differences in carcase   between animals in temperament.  Docility EBVs are expressed as
       weight at the standard age of 750 days.                differences in the percentage of progeny that will be scored with
       Eye Muscle Area EBV (sq cm) is calculated from         acceptable temperament (ie. either “docile” or “restless”).
       measurements from live animal ultrasound scans and from abattoir
       carcase data, adjusted to a standard                   SELECTION INDEXES
                                                              There are currently three different selection indexes calculated for
       400 kg carcase.  This EBV estimates genetic differences in eye
       muscle area at the 12/13th rib site of a 400 kg dressed carcase.    New Zealand Angus animals. These are Self-Replacing, AngusPure
       More positive EBVs indicate better muscling on animals.  Sires with   and Heifer/Dairy Terminal.  Each selection index describes a different
       relatively higher EMA EBVs are expected to produce better-muscled   production/market scenario and relates to a typical commercial herd
       and higher percentage yielding progeny at the same carcase weight   in New Zealand that is targeting the following specifications.
       than will sires with lower EMA EBVs.                   Index values are reported as EBVs, in units of relative earning
       Rib Fat and Rump Fat EBVs (mm) are calculated from     capacity ($’s) for a given market.  They reflect both the short-term
       measurements of subcutaneous fat depth at the 12/13-rib site and   profit generated by a sire through the sale of his progeny, and the
       the P8 rump site (from live animal ultrasound scans and from abattoir   longer-term profit generated by his daughters in a self-replacing
       carcases) and are adjusted to a standard 400 kg carcase.  These   cow herd. More information is available on selecting animals using a
       EBVs are indicators of the genetic differences in fat distribution on a   selection index.
       standard 400 kg carcase.  Sires with low, or negative, fat EBVs are   The Index values are derived using BreedObject technology.  More
       expected to produce leaner progeny at any particular carcase weight   information is available from the BreedObject web site.
       than will sires with higher EBVs.                      Self-Replacing Index ($) - Estimates genetic differences
       Retail Beef Yield EBV (%) indicates genetic differences   between animals in net profitability per cow joined for a self-replacing
       between animals for retail yield percentage in a standard 400 kg   commercial herd, targeting the production of grass finished steers.
       carcase.  Sires with larger EBVs are expected to produce progeny   Steers are assumed marketed at 525 kg live weight (280 kg carcase
       with higher yielding carcases.                         weight and 10 mm fat depth) at 16 months of age.
       Intramuscular Fat EBV (%) is an estimate of the genetic   AngusPure Index ($) – Estimates the genetic differences
       difference in the percentage of intramuscular fat at the 12/13th rib   between animals in net profitability per cow joined in an example self-
       site in a 400 kg carcase.  Depending on market targets, larger more   replacing commercial Angus herd that targets the production of grass
       positive values are generally more favourable.
                                                              finished steers for the AngusPure programme.  Steers are assumed
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