Page 8 - Moanaroa Angus Catalogue 2021 ebook

Selection Indexes

There are currently three selection indexes calculated for New Zealand Angus HDT +145 +135 +129 +122 +115 +109 +104 +98 +92 +84 +74 +65 +44 TACE analysis
animals. These are Self-Replacing, AngusPure and Heifer/Dairy Terminal. Each
selection index describes a different production/market scenario and relates
to a typical commercial herd in New Zealand that is targeting the following Index API $ +214 +183 +168 +148 +134 +120 +105 +89 +74 +57 +35 +21 -2
specifications. Based on the results of the May 2021
Index values are reported as EBVs, in units of relative earning capacity ($) for a SRI +168 +146 +135 +124 +116 +108 +101 +93 +86 +76 +63 +54 +27
given market. They reflect both the short-term profit generated by a sire through
the sale of his progeny, and the longer-term profit generated by his daughters in a IMF +4.4 +3.6 +3.2 +2.7 +2.3 +2.0 +1.7 +1.5 +1.2 +0.9 +0.4 +0.1 -0.5
self-replacing cow herd. More information is available on selecting animals using
a selection index. %
The Index values are derived using BreedObject technology. More information is RBY +2.7 +2.0 +1.6 +1.2 +0.9 +0.7 +0.4 +0.2 +0.0 -0.3 -0.8 -1.2 -2.0
available from the BreedObject web site.
Self-Replacing Index ($) - Estimates the genetic differences between animals in P8 +3.4 +2.2 +1.6 +1.0 +0.5 +0.2 -0.2 -0.6 -1.0 -1.4 -2.1 -2.7 -3.9
net profitability per cow joined in an example self-replacing commercial herd that Carcase mm
targets the production of grass finished steers. Steers are assumed marketed at Rib +3.3 +2.2 +1.7 +1.1 +0.7 +0.3 +0.0 -0.3 -0.6 -1.0 -1.5 -2.0 -3.0
approximately 480 kg live weight (265 kg carcase weight and 7 mm fat depth) at
approximately 16 months of age. Selected heifers are retained for breeding and the Negative (lower) values more favourable
balance marketed at approximately 16 months weighing 415 kgs (230 kg carcase EMA sq.cm +12.2 +10.0 +8.8 +7.5 +6.6 +6.0 +5.3 +4.7 +4.1 +3.3 +2.2 +1.3 -0.4
weight and 8 mm fat depth) As some daughters are retained, maternal traits are
also of importance.
AngusPure Index ($) – Estimates the genetic differences between animals in net Cwt kg +89 +81 +76 +71 +68 +65 +62 +59 +55 +50 +43 +36 +26
profitability per cow joined in an example self-replacing commercial Angus herd
that targets the production of grass finished steers for the AngusPure programme. DC days -9.5 -8.0 -7.2 -6.2 -5.5 -4.9 -4.3 -3.7 -3.1 -2.3 -1.2 -0.1 +2.1
Steers are assumed marketed at 530 kg live weight (290 kg carcase weight and 2021 TRANSTASMAN ANGUS CATTLE EVALUATION PERCENTILE BAND FOR ALL 2019 - BORN ANIMALS Fertility
10 mm fat depth) at approximately 20 months of age. Selected heifers are retained
for breeding and the balance marketed at approximately 20 months weighing SS cm +4.2 +3.4 +3.0 +2.6 +2.3 +2.1 +1.9 +1.7 +1.5 +1.2 +0.8 +0.4 -0.3
450 kg (240 kg carcase weight and 10 mm fat depth). A significant premium for
carcase quality was assumed and, as some daughters are retained, maternal traits Milk +27 +24 +22 +20 +18 +17 +16 +15 +14 +12 +10 +9 +6
are also of importance.
Heifer/Dairy Terminal Index ($) – Estimates the genetic differences between
animals in net profitability per female joined in an example herd where all progeny Mwt +150 +132 +123 +113 +106 +101 +95 +90 +85 +78 +68 +59 +42
are marketed. All progeny are marketed at approximately 510 kg live weight (280
kg carcase weight and 7 mm fat depth) at approximately 24 months of age. Growth 600 kg +153 +140 +133 +125 +119 +114 +110 +106 +101 +95 +86 +78 +63
Note that $Index values for individual animals are sensitive to the assumptions Negative (lower) values more favourable
used in the BreedObject analysis to calculate the selection index. More information
is available on the weightings used in the New Zealand Angus Selection Indexes. 400 +115 +105 +100 +95 +91 +87 +84 +81 +78 +73 +67 +62 +51
200 +65 +59 +56 +53 +50 +48 +47 +45 +42 +40 +35 +32 +25

Bwt kg +0.1 +1.4 +2.1 +2.8 +3.4 +3.8 +4.2 +4.6 +5.0 +5.6 +6.3 +6.9 +8.2
Birth
GL days -10.3 -8.3 -7.3 -6.2 -5.5 -4.9 -4.3 -3.8 -3.2 -2.5 -1.4 -0.4 +1.6

Calv-Ease Dtrs Dir % +10.7 +12.1 +8.7 +9.8 +7.5 +8.4 +5.9 +6.5 +4.7 +5.0 +3.6 +3.7 +2.5 +2.3 +1.3 +0.9 +0.1 -0.7 -1.5 -2.6 -3.9 -5.4

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