Page 8 - Waiterenui 2020
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BREEDPLAN                                               www.waiterenui.co.nz


       relatively higher EMA EBVs are expected to produce better-muscled   SELECTION INDEXES
       and higher percentage yielding progeny at the same carcase weight   There are currently two different selection indexes calculated
       than will sires with lower EMA EBVs.                    for New Zealand Angus animals. These are Self-Replacing and
       RIB FAT AND RUMP FAT EBVS (mm) are calculated from measurements of   AngusPure. Each selection index describes a different production/
       subcutaneous fat depth at the 12/13-rib site and the P8 rump site   market scenario and relates to a typical commercial herd in New
       (from live animal ultrasound scans and from abattoir carcases) and   Zealand that is targeting the following specifications.
       are adjusted to a standard 400 kg carcase. These EBVs are indicators   Index values are reported as EBVs, in units of relative earning
       of the genetic differences in fat distribution on a standard 400   capacity ($’s) for a given market. They reflect both the short-term
       kg carcase. Sires with low, or negative, fat EBVs are expected to   profit generated by a sire through the sale of his progeny, and the
       produce leaner progeny at any particular carcase weight than will   longer-term profit generated by his daughters in a self-replacing
       sires with higher EBVs.                                 cow herd. More information is available on selecting animals using
       RETAIL BEEF YIELD EBV (%) indicates genetic differences between animals   a selection index.
       for retail yield percentage in a standard 400 kg carcase. Sires with   The Index values are derived using BreedObject technology. More
       larger EBVs are expected to produce progeny with higher yielding   information is available from the BreedObject web site.
       carcases.
       INTRAMUSCULAR FAT EBV (%) is an estimate of the genetic difference   SELF-REPLACING  INDEX ($) - Estimates genetic differences between
                                                               animals in net profitability per cow joined for a self-replacing
       in the percentage of intramuscular fat at the 12/13th rib site in a   commercial herd, targeting the production of grass finished steers.
       400 kg carcase. Depending on market targets, larger more positive   Steers are assumed marketed at 525 kg live weight (280 kg carcase
       values are generally more favourable.                   weight and 10 mm fat depth) at 16 months of age.
       DOCILITY EBV (%) is an estimate of the genetic differences between   ANGUSPURE INDEX ($) – Estimates genetic differences between animals
       animals in temperament. Docility EBVs are expressed as differences   in net profitability per cow joined for a self-replacing commercial
       in the percentage of progeny that will be scored with acceptable   Angus herd, targeting the production of grass finished steers for the
       temperament (ie. either “docile” or “restless”).        AngusPure programme. Steers are assumed marketed at 525 kg live
                                                               weight (280 kg carcase weight and 10 mm fat depth) at 18 months
                                                               of age with a significant premium paid for marbling.




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