Page 8 - Hinewaka Shorthorns Catalogue ebook

The Self - Replacing Index
“The Self-replacing Index” ranks bulls on their ability to generate
profit (profit per cow mated) in a herd situation in which some
females are retained for breeding and surplus females, along with
all males, are slaughtered.
The main drivers of profit addressed by the Index include (in order
of economic importance): ROYALLA REMBRANDT K413 (IMP AUS) - Roan
• Direct and Maternal Calving Ease
• Growth Born: 11/09/14 H.B. AUJSNK413
• Meat Yield
• Cow Survival
• Finishing Ability
• Fertility
• Cow Efficiency
In short, selection on the Index is expected to favour production of
a cowherd with excellent reproductive efficiency, rearing progeny
with moderate-to-high growth rates and high yielding carcasses.
• Comparing the lifetime profitability of two bulls:
The following example illustrates how potential differences in
lifetime profitability can be approximated between bulls with
different Indexes. These estimates of value differences may be
conservative.
Two bulls with Self-replacing Indexes of $40 and $20 are mated
to genetically similar cows. If each bull mates 200 cows during
its lifetime, the first bull will generate $2000 ($(40-20)/2 x 200) MARELLAN INDESTRUCTABLE Roan
more profit during its lifetime than the second bull (the $20 profit Sire: ROYALLA OSTENTATIOUS G404 Roan
advantage must be divided by 2 because a bull only passes half MARELLAN REDWING J6065 Roan
his genes on to each of his progeny).
The Dairy Index WEEBOLLABOLLA THEODORE T85 (P) (S.F.A.) (IMP AUS) Roan
Estimates the genetic differences between animals in net Dam: MARELLAN DORA 8074L Red
profitability per cow joined for an example commercial dairy herd INVERARY DORA W184 Red
targeting the production of dairy beef progeny from dairy cows and
heifers where all progeny are slaughtered. Steers are assumed 2021 SHORTHORN BREEDPLAN AVERAGES
marketed at 520 kg live weight (280 kg carcase weight and 6 mm FOR 2019 BORN CALVES
fat depth) at 20 months of age. While calving ease is by far the
most important profit driver in the Index, growth and to a lesser DIR DTRS GL Birth 200 Wt 400 Wt 600 Wt McW Milk
extant meat yield also contribute.
+9.0 +1.4 -4.2 +2.4 +40 +53 +59 +48 +5
INDEX VALUES ($) 73% 61% 92% 95% 92% 94% 93% 78% 51%
Self Replacing +64 SS DtC CWT EMA Rib Rump RBY% IMF%
Dairy +36 +3.4 -8.5 +44 +7.5 -0.3 -1.9 +2.1 -0.4
89% 63% 76% 80% 83% 82% 76% 69%

The Australasian Shorthorn GROUP BREEDPLAN INDEX VALUES ($)
Estimated Breeding Values contained in this Sale Catalogue Self Replacing +$93 Dairy +$84
were compiled by the Agricultural Business Research
Institute (ABRI) from data supplied by the breeders. Neither A sire that has added a tremendous amount to our breeding programme.
Average BW with tremendous 200D Growth and 400D Growth, but leaving
the New Zealand Beef Shorthorn Association nor the ABRI medium framed cattle. A trait leader for Gestation Length, 200D, 400D
oversee or audit the collection of this data. Growth, Eye Muscle, Scrotal, Carcass Weight and Retail Beef Yield.
The sire of 9 bulls in the sale and the fi rst 5 Lots catalogued.
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