Page 93 - Hereford Magazine 2022

EXPLAINING ACCURACY PERCENTAGES

By definition, an EBV is an estimate of an animal’s true Animals should be compared on EBVs regardless
breeding value and therefore it may change with the of accuracy. However, where two animals have the
addition of more pedigree and performance information. same EBV, the animal with the higher accuracy would
An accuracy value is presented with every EBV. The normally be used more heavily than the animal with the
accuracy provides a measure of the stability of the EBV lower accuracy because the results are more predictable.
and gives an indication of the amount of information
that has been used in the calculation of that EBV. The The following guide is useful for interpreting accuracy:
higher the accuracy the lower the likelihood of changes • More than 90%: high accuracy estimate of the
in the animal’s EBV as more information is analysed for animal’s true breeding value. It is unlikely that
that animal, its progeny, or its relatives. EBVs will change much with the addition of more
Breedplan uses all available information to calculate progeny data.
EBVs and calculates EBVs of related (correlated) traits • 75 to 90%: medium-high accuracy, with some
via indirect observations e.g. the EBVs for carcass progeny information included.
traits are usually estimated from live animal scanning • 50 to 74%: medium accuracy, usually based on the
measurements. These correlated estimates will have animal’s own records and pedigree.
lower accuracy than when estimates come from direct • Less than 50%: EBVs are preliminary and could
observations. change substantially as more performance
It is important to keep accuracy in perspective. information becomes available.
Accuracy and genetic merit are not the same things. It is
possible for animals to have very low EBVs but for these EBVs with less than 20% accuracy will not be reported.
EBVs to be highly accurate. Conversely, animals may
have high EBVs with low accuracy. [Credit: ABRI]

Will be on o er at
2022 National Hereford
Seed Stock Sale 10th of May 2022

ANNUAL
BULL SALE
13 OCTOBER 2022
TH
@ 12 NOON
WESTHOLM TRUST V85
50 WELL-GROWN
YEARLING BULLS

SEMEN TESTED, BVD TESTED &
VACCINATED x2
SUITABLE FOR HEIFER & COW MATING WESTHOLM TRUST V85
NJW 73S M326 TRUST 100W (P)
R1 BULLS ON OFFER SIRED BY: SIRE: WESTHOLM TRUST T44 (P)
POLLED HEREFORD WESTHOLM MADAM O85(P)
Westholm Justin U32
ARDO FARGO 1154 (P)
Westholm Fargo U66 DAM: WESTHOLM JULIE R 41 (P)
Beechwood Irish Eyes 24 WESTHOLM JULIE P95 (P)
ANGUS FEBRUARY 2022 NZ HEREFORD GROUP BREEDPLAN EBVs
Taimate Lazarus L12 EBV DIR DTRS GL BWT 200 400 600 MWT MILK SS DTC
Rockley Q1 BULL +10.6 +8.7 -0.6 +0.2 +30 +62 +85 +60 +23 +3.3 -4.9
B Avg +2.5 +2.2 -0.7 +4.0 +33 +55 +78 +66 +17 +2.1 -3.1
FOR MORE INFO CONTACT: Search: Kane Farms
ROBERT KANE - P: +64 3 204 8236 EBV CWT EMA RIB RUMP RBY IMF INDEXES ($)
PETER KANE - M: 027 234 9602 BULL +61 +5.1 +1.9 +2.5 +0.8 +1.3 HP +$162 BH +$244
E: westholm@farmside.co.nz B Avg +51 +3.8 +0.8 +1.0 +0.8 +0.6 DB +$141

Year 2022 HEREFORD MAGAZINE 91