What is the required accuracy of a test related to genetic improvement

J.B.M. Wilmink

What is the required accuracy of a test related to genetic improvement

in Breeding, production recording, health and the evaluation of farm animals

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J.B.M. Wilmink

J.B.M. Wilmink NRS, PO Box 454, 6800 AL Arnhem, The Netherlands

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Art:: Kapitel

Seiten:: 323

DOI:: https://doi.org/10.3920/9789086865932_057

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In 1998 a report is presented by an ICAR-INTERBULL task force group to the ICAR board on the effect of accuracy of recording on genetic progress. Member of the task force group were: Petra Galesloot (NL), Dave Johnson (NZ), Wijbrand Ouweltjes (NL), Andrea Rosati (IT), Larry Schaeffer (CAN), Torstein Steine (N), Paul VanRaden (USA), Hans Wilmink (NL, convenor). The main conclusion in that report were that genetic gain is hardly effected if recording intervals increase to 8 weeks; that test in mid lactations have most predictive value for 305 day records; that a decrease meter accuracy with 1 kg is equivalent to increase of recording interval with 1 week; that is more important to invest in data quality check by storage of recorded data in an integrated database. The recommendations to the ICAR board were therefore that meter accuracy can be relaxed; that minimum number of tests in lactation should be 4 and that recording systems should be more flexible.

Galesloot and Ouweltjes (1998) studied the effect of different rates of accuracy of a milk meter on the heritability a measured trait and thus on genetic progress. In case of daily measurements, no decrease in heritability was could if meters became less accurate till 10%. In case of recording at 4 weekly intervals, the decrease in heritability was 0.02 if meters become 10% less accurate. In case of recording at 8 weekly intervals this decrease was also 0.02.

It is concluded that the accuracy of meters can be relaxed, at least till 10%. This will not effect genetic progress. It is still important that meters are unbiased. Main emphasis should be to keep the costs for recording al low as possible in order to make recording attractive in the market. Thus a significant reduction of costs of meters or costs for analysis of the milk content would be most important. In line measurements of milk content would be still of interest, if accuracy is low, but bias is zero.

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Breeding, production recording, health and the evaluation of farm animals

Reihe: EAAP Scientific Series, Band: 121

ISBN:: 9789086865932

Verleger:: Wageningen Academic

Print-Publikationsdatum:: 01 Nov 2007

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- Biowissenschaften
  - Allgemein
  - Tiere und Veterinärmedizin

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What is the required accuracy of a test related to genetic improvement

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Breeding, production recording, health and the evaluation of farm animals

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