Estimation of Genetic Parameters for Somatic Cell Score in Holsteins

Y. Da; M. Grossman; I. Misztal; G. R. Wiggans

doi:10.3168/jds.S0022-0302(92)77987-9

Estimation of Genetic Parameters for Somatic Cell Score in Holsteins

Y. Da
, M. Grossman
, I. Misztal
, G. R. Wiggans

Animal Science

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

Abstract

Genetic parameters of somatic cell scores for Holstein cows were estimated using an animal model and REML for two data sets. Set 1, with 13,017 records from 5278 cows, was used to obtain variance components, heritability, and repeatability for two lactation measures: the simple average and the weighted average of test day data. Set 2, with 14,418 records from 4806 cows, was used to obtain genetic correlations for the simple average between lactations 1 and 2, between lactations l and 3, and between lactations 2 and 3. Simple and weighted average of test day somatic cell scores had the same heritabilities (.12) and repeatabilities (.35). Phenotypic variances were about 1.2, and herd-sire interaction variances were small (.002). Genetic correlation for somatic cell score was about .55 between lactations 1 and 2 and between lactations l and 3 and .65 between lactations 2 and 3. Phenotypic correlation was .20 between lactations 1 and 2, .16 between lactations 1 and 3, and .31 between lactations 2 and 3.

Original language	English (US)
Pages (from-to)	2265-2271
Number of pages	7
Journal	Journal of Dairy Science
Volume	75
Issue number	8
DOIs	https://doi.org/10.3168/jds.S0022-0302(92)77987-9
State	Published - 1992

Bibliographical note

Funding Information:
Received September 27, 1991. Accepted March 23, 1992. 'Supported in part by the Illinois Agricultural Experi- ment Station, Hatch Project 35-367. *Reprint requests. 3Supported by the Holstein Association.

Funding Information:
The authors thank two anonymous reviewers and W. J. Koops, M. M. Schutz, R. D. Shanks, and P. M. VanRaden for valuable comments and suggestions and Cindy Ernst for help in preparing the data. Computing support was provided by the National Center for Su- percomputer Applications at the University of Illinois at Urbana-Champaign and by the Cor-ne11 National Supercomputer Facility, which is funded in part by the National Science Foundation, New York State, and IBM Corporation.

Keywords

Holsteins
SA
SCS
WA
genetic parameters
simple average of SCS for test day data
somatic cell score
somatic cell scores
variance components
weighted average of SCS for test day data

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abstract = "Genetic parameters of somatic cell scores for Holstein cows were estimated using an animal model and REML for two data sets. Set 1, with 13,017 records from 5278 cows, was used to obtain variance components, heritability, and repeatability for two lactation measures: the simple average and the weighted average of test day data. Set 2, with 14,418 records from 4806 cows, was used to obtain genetic correlations for the simple average between lactations 1 and 2, between lactations l and 3, and between lactations 2 and 3. Simple and weighted average of test day somatic cell scores had the same heritabilities (.12) and repeatabilities (.35). Phenotypic variances were about 1.2, and herd-sire interaction variances were small (.002). Genetic correlation for somatic cell score was about .55 between lactations 1 and 2 and between lactations l and 3 and .65 between lactations 2 and 3. Phenotypic correlation was .20 between lactations 1 and 2, .16 between lactations 1 and 3, and .31 between lactations 2 and 3.",

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note = "Funding Information: Received September 27, 1991. Accepted March 23, 1992. 'Supported in part by the Illinois Agricultural Experi- ment Station, Hatch Project 35-367. *Reprint requests. 3Supported by the Holstein Association. Funding Information: The authors thank two anonymous reviewers and W. J. Koops, M. M. Schutz, R. D. Shanks, and P. M. VanRaden for valuable comments and suggestions and Cindy Ernst for help in preparing the data. Computing support was provided by the National Center for Su- percomputer Applications at the University of Illinois at Urbana-Champaign and by the Cor-ne11 National Supercomputer Facility, which is funded in part by the National Science Foundation, New York State, and IBM Corporation.",

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Estimation of Genetic Parameters for Somatic Cell Score in Holsteins

Abstract

Bibliographical note

Keywords

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