Page 38 - Black Ridge Angus Sale 2021 ebook

BLACK RIDGE ANGUS BULL SALE
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M Mature Cow Weight (kg) - Estimates relative genetic merit in cow weight (kg) at
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5 years of age.

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M Milk (kg) - Genetic estimate of milk production, measured as variation in 200-day
weight (kg) of daughter’s calves.

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S Scrotal Size (cm) - Genetic estimate of scrotal circumference (cm) at 400 days of
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age.

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D Days to Calving – Genetic estimate in female fertility, expresses as the number of
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days from start to the joining period until subsequent calving.

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C Carcase Weight (kg) - Genetic estimate of carcase weight, adjusted to 650 days of
age.

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E Eye muscle are (cm²) - Genetic estimate of eye muscle area at the 12/13th rib site
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in a 300kg carcase.

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R Rib fat (mm) - Genetic estimate of fat depth (mm) in a 300kg carcase at the
12/13th rib site.

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R Rump fat (mm) - Genetic estimate of fat depth (mm) at the P8 rump site in a
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300kg carcase.

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R Retail beef yeild % (rby%) - Genetic estimate of percent retail beef yeild in a 300kg
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%

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carcase.

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I Intra-muscular fat % (imf%) - Genetic estimate of percent intramuscular fat
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(marbling) at the 12/13th rib site in a 300kg carcase.

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S Self Replacing Index - Estimates the genetic differences between animals in net
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profitability per cow joined for an example commercial herd (self replacing herd
run in a temperate enviroment) in which some females are retained for breeding and
surplus females, along with all males, are slaughtered. Steers are assumed marketed
at 525 kg live weight (280 kg carcase weight) by 16 months of age. The Index is
expected to favour production of a cow herd with excellent reproductive efficiency,
rearing progeny with moderate to high growth rates and high yeilding carcasses.

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A Angus Pure Index - Estimates the genetic differences between animals in net
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profitability per cow joined for an example commerical herd (self replacing herd
run in a temperate environment) in which some females are retained for breeding
and surplus females, along with all males, are slaughtered. Steers are assumed
marketed at 525 kg live weight (280 kg carcase weight) by 16 months of age with a
significant premium paid for marbling. This Index is similar to the Self Replacing
Index but will tend to highlight higher marbling sires.

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C Completeness of Performance
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This is a summary of what Black Ridge Stud records on the Angus NZ Database.
Black Ridge’s Star Rating is 4.5 / 5
Information on performance recording is available on request

EBV’s in this catalogue are from April 2021