Page 10 - Tangihau Angus Catalogue 2021 ebook

TACE EBVS - HOW TO USE THEM

at the 12/13th rib site (Rib Fat) and P8 rump site that targets the production of grass finished steers.
(Rump Fat), in a 400kg carcase. Very fat cattle may Steers are assumed marketed at approximately 480
produce less yield, however cattle that are too lean kg live weight (265 kg carcase weight and 7 mm fat
may run into fertility problems, so these figures need depth) at approximately 16 months of age. Selected
to be monitored. The best way to monitor yield and heifers are retained for breeding and the balance
fertility is to keep an eye on those traits rather than marketed at approximately 16 months weighing 415
concentrating on fat depths. kgs (230 kg carcase weight and 8 mm fat depth) As
some daughters are retained, maternal traits are also
Retail Beef Yield % (RBY%) RBY% tells us the of importance.
expected genetic differences between animals in
percentage retail beef yield in a 400kg carcase. A ANGUSPURE INDEX - Estimates the genetic
higher positive figure here is better. differences between animals in net profitability per cow
joined in an example self-replacing commercial Angus
Intra-muscular Fat % (IMF%) Marbling is very herd that targets the production of grass finished steers
important for the premium markets. Ultrasound for the AngusPure programme. Steers are assumed
scanning measurements for IMF (which are highly marketed at 530 kg live weight (290 kg carcase weight
correlated to actual marble score) are used to provide and 10 mm fat depth) at approximately 20 months of
us with an EBV that estimates the genetic differences age. Selected heifers are retained for breeding and
between animals in marbling at the 12/13th rib site in a the balance marketed at approximately 20 months
400kg carcase. A higher positive value here is better. weighing 450 kg (240 kg carcase weight and 10 mm

NEW ZEALAND ANGUS fat depth). A significant premium for carcase quality
was assumed and, as some daughters are retained,
SELECTION INDEXES maternal traits are also of importance.
There are currently three selection indexes calculated for HEIFER/DAIRY TERMINAL INDEX ($) – Estimates
New Zealand Angus animals. These are Self-Replacing, the genetic differences between animals in net
AngusPure and Heifer/Dairy Terminal. Each selection profitability per female joined in an example herd
index describes a different production/market scenario where all progeny are marketed. All progeny are
and relates to a typical commercial herd in New Zealand marketed at approximately 510 kg live weight (280 kg
that is targeting the following specifications. carcase weight and 7 mm fat depth) at approximately
Index values are reported as EBVs, in units of relative 24 months of age.
earning capacity ($) for a given market. They reflect both The TransTasman Angus Cattle Evaluation
the short-term profit generated by a sire through the sale Estimated Breeding Values contained in this Sale
of his progeny, and the longer-term profit generated by Catalogue were compiled by the Agricultural
his daughters in a self-replacing cow herd. The Index Business Research Institute (ABRI) from data
values are derived using BreedObject technology supplied by the Breeders. Neither the NZ Angus
SELF REPLACING INDEX - Estimates the genetic Association nor the ABRI oversee or audit the
differences between animals in net profitability per cow collection of this data.
joined in an example self-replacing commercial herd

2021 BREED AVERAGE EBV’S FOR 2019 BORN CALVES
DIR DTRS GL BIRTH 200 400 600 MWT MILK SS DC
+1.8 +2.1 -4.4 +4.2 +46 +84 +110 +95 +16 +1.9 -4.2

CWT EMA RIB RUMP RBY IMF INDEXES SRI API HDT
+61 +5.4 +0.1 -0.2 +0.4 +1.8 +$100 +$104 +$102

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