JDS Track the topics, authors and articles important to you
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]
Author:
Keyword(s):
Year:  Vol:  Page: 


Reprint (PDF) Version of this Article
Similar articles found in:
JDS Online
PubMed
PubMed Citation
Search PubMed for articles by:
Da, Y. || Wiggans, G. R.
Alert me when:
new articles cite this article
Download to Citation Manager

Journal of Dairy Science, Vol 75, Issue 8 2265-2271, Copyright 1992 by American Dairy Science Association


JOURNAL ARTICLE

Estimation of genetic parameters for somatic cell score in Holsteins

Y. Da, M. Grossman, I. Misztal and G. R. Wiggans
Department of Animal Sciences, University of Illinois, Urbana 61801.

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 1 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 1 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.




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright 1992 by the American Dairy Science Association.