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

Timo Pitkänen; Esa A Mäntysaari; Ulrik S Nielsen; Gert P Aamand; Per Madsen; Martin H Lidauer

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

Timo Pitkänen, Esa A Mäntysaari, Ulrik S Nielsen, Gert P Aamand, Per Madsen, Martin H Lidauer

Center for Quantitative Genetics and Genomics

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Abstract

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

Original language	English
Title of host publication	INTERBULL BULLETIN
Number of pages	6
Volume	46
Publication date	May 2012
Pages	103-108
Publication status	Published - May 2012
Event	Interbull meeting - Cork, Ireland Duration: 28 May 2012 → 31 May 2012 Conference number: 2012

Conference

Conference	Interbull meeting
Number	2012
Country/Territory	Ireland
City	Cork
Period	28/05/2012 → 31/05/2012

Keywords

Residual variance
genetic evaluation model
Nordic Holstein

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title = "Measurement Error Variance of Test-Day Obervations from Automatic Milking Systems",

abstract = "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",

keywords = "Residual variance, genetic evaluation model, Nordic Holstein",

author = "Timo Pitk{\"a}nen and M{\"a}ntysaari, {Esa A} and Nielsen, {Ulrik S} and Aamand, {Gert P} and Per Madsen and Lidauer, {Martin H}",

year = "2012",

month = may,

language = "English",

volume = "46",

pages = "103--108",

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note = "Interbull meeting ; Conference date: 28-05-2012 Through 31-05-2012",

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T1 - Measurement Error Variance of Test-Day Obervations from Automatic Milking Systems

AU - Pitkänen, Timo

AU - Mäntysaari, Esa A

AU - Nielsen, Ulrik S

AU - Aamand, Gert P

AU - Madsen, Per

AU - Lidauer, Martin H

N1 - Conference code: 2012

PY - 2012/5

Y1 - 2012/5

N2 - 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

AB - 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

KW - Residual variance

KW - genetic evaluation model

KW - Nordic Holstein

M3 - Article in proceedings

VL - 46

SP - 103

EP - 108

BT - INTERBULL BULLETIN

T2 - Interbull meeting

Y2 - 28 May 2012 through 31 May 2012

ER -

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

Abstract

Conference

Keywords

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