Simulation study on heterogeneous variance adjustment for observations with different measurement error variance

Publikation: Bidrag til bog/antologi/rapport/proceedingKonferencebidrag i proceedingsForskning

  • Timo Pitkänen, MTT Agrifood Research, Biotechnology and Food Research, Genetic Research, Finland
  • Esa A Mäntysaari, MTT Agrifood Research, Biotechnology and Food Research, Genetic Research, Finland
  • Ulrik Sander Nielsen, The Knowledge Centre for Agriculture, Cattle, Danmark
  • Gert Pedersen Aamand, NAV Nordic Cattle Genetic Evaluation, Danmark
  • Per Madsen
  • Martin H Lidauer, MTT Agrifood Research, Biotechnology and Food Research, Genetic Research, Finland
The Nordic Holstein yield evaluation model describes all available milk, protein and fat test-day yields from Denmark, Finland and Sweden. In its current form all variance components are estimated from observations recorded under conventional milking systems. Also the model for heterogeneity of variance correction is developed for the same observations. As automated milking systems are becoming more popular the current evaluation model needs to be enhanced to account for the different measurement error variances of observations from automated milking systems. In this simulation study different models and different approaches to account for heterogeneous variance when observations have different measurement error variances were investigated. Based on the results we propose to upgrade the currently applied models and to calibrate the heterogeneous variance adjustment method to yield same genetic variance for both milking systems
OriginalsprogEngelsk
TitelProceedings of the 2013 Interbull meeting : Interbull Bulletin
Antal sider5
Vol/bind47
UdgivelsesstedSLU PrintOffice
ForlagInternational Bull Evaluation Service
Udgivelsesår24 aug. 2013
Sider182-186
ISBN (trykt)1011-6079
StatusUdgivet - 24 aug. 2013
BegivenhedINTERBULL MEETING - Nates, Frankrig
Varighed: 23 aug. 201325 aug. 2013
Konferencens nummer: 2013

Konference

KonferenceINTERBULL MEETING
Nummer2013
LandFrankrig
ByNates
Periode23/08/201325/08/2013

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