Page 12 - Tangihau 2020
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TACE EBVS - HOW TO USE THEM



         the genetic differences between animals in fat depth   SELF REPLACING INDEX - Estimates the genetic
         at the 12/13th rib site (Rib Fat) and P8 rump site   differences between animals in net profitability per
         (Rump Fat), in a 400kg carcase. Very fat cattle may   cow joined for an example commercial herd (self
         produce less yield, however cattle that are too lean   replacing herd run in a temperate environment) in which
         may run into fertility problems, so these figures need   some females are retained for breeding and surplus
         to be monitored. The best way to monitor yield and   females, along with all males, are slaughtered. Steers
         fertility is to keep an eye on those traits rather than   are assumed marketed at 525 kg live weight (280 kg
         concentrating on fat depths.                         carcase weight and 10 mm fat depth) at 16 months of
                                                              age.
         Retail Beef Yield % (RBY%) RBY% tells us the
         expected genetic differences between animals in      ANGUSPURE INDEX - Estimates the genetic
         percentage retail beef yield in a 400kg carcase. A   differences between animals in net profitability per
         higher positive figure here is better.               cow joined for an example commercial herd (self
                                                              replacing herd run in a temperate environment) in
         Intra-muscular Fat % (IMF%) Marbling is very         which some females are retained for breeding and
         important for the premium markets. Ultrasound        surplus females, along with all males, are slaughtered.
         scanning measurements for IMF (which are highly      Steers are assumed marketed at 565 kg live weight
         correlated to actual marble score) are used to provide   (280 kg carcase weight and 10 mm fat depth) at 20
         us with an EBV that estimates the genetic differences   months of age with a significant premium paid for
         between animals in marbling at the 12/13th rib site   marbling.
         in a 400kg carcase. A higher positive value here is
         better.                                              All selection indexes are reported as an EBV, in units
                                                              of relative earning capacity ($) for a given production/
                                                              market scenario. They reflect both the short term profit
           NEW ZEALAND ANGUS                                  generated by a sire through the sale of his progeny,
                                                              and the longer term profit generated by his daughters
           SELECTION INDEXES                                  in a self replacing cow herd (where applicable).

                                                              The TransTasman Angus Cattle Evaluation
         There are currently two different selection indexes   Estimated Breeding Values contained in this Sale
         calculated for New Zealand Angus animals. These are   Catalogue were compiled by the Agricultural
         the Self Replacing Index and AngusPure Index.        Business Research Institute (ABRI) from data
                                                              supplied by the Breeders. Neither the NZ Angus
         Each selection index describes a different           Association nor the ABRI oversee or audit the
         production/market scenario and relates to a typical   collection of this data.
         commercial herd in NZ that is targeting the following
         specifications.





                                          2020 BREED AVERAGE EBV’S FOR 2018 BORN CALVES
             DIR      DTRS      GL      BIRTH     200      400       600      MWT      MILK      SS       DC
             +1.7     +1.9     -4.3      +4.2     +46      +83      +109      +95      +16      +1.9      -4.4

             CWT      EMA       RIB      RUMP     RBY       IMF                               SRI        API
                                                                                INDEXES
             +60      +5.3      +0.0     -0.2     +0.4      +1.8                             +$114      +$134






















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