Measurement Error Variance of Test-Day Obervations from Automatic Milking Systems

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

Dokumenter

  • Timo Pitkänen, Genetic Research, MTT Agrifood Research Finland, Finland
  • Esa A Mäntysaari, Genetic Research, MTT Agrifood Research Finland, Finland
  • Ulrik S Nielsen, The Knowledge Centre for Agriculture, Cattle, Danmark
  • Gert P Aamand, Nordic Cattle Genetic Evaluation, Danmark
  • Per Madsen
  • Martin H Lidauer, MTT, Agrifood Research Finland, Biotechnology and Food Research, Genetic Research Group, Finland
Automated milking systems (AMS) are becoming more popular in dairy farms. In this paper we present an approach for estimation of residual error covariance matrices for AMS and conventional milking system (CMS) observations. The variances for other random effects are kept as defined in the evaluation model. AMS residual variances were found to be 16 to 37 percent smaller for milk and protein yield and 42 to 47 percent larger for fat yield compared to CMS
OriginalsprogEngelsk
TitelINTERBULL BULLETIN
Antal sider6
Vol/bind46
Udgivelsesårmaj 2012
Sider103-108
StatusUdgivet - maj 2012
BegivenhedInterbull meeting - Cork, Irland
Varighed: 28 maj 201231 maj 2012
Konferencens nummer: 2012

Konference

KonferenceInterbull meeting
Nummer2012
LandIrland
ByCork
Periode28/05/201231/05/2012

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