Document Detail

Genetic correlations among production, body size, udder, and productive life traits over time in Holsteins.
MedLine Citation:
PMID:  15290995     Owner:  NLM     Status:  MEDLINE    
Genetic correlations among milk, fat, and protein yields; body size composite (BSC); udder composite (UDC); and productive life (PL) in Holsteins were investigated over time. The data set contained 25,280 records of cows born in Wisconsin between 1979 and 1993. The multiple trait random regression (MT-RR) animal model included registration status, herd-year, age group, and stage of lactation as fixed effects; additive genetic effects with random regressions (RR) on year of birth using the first-order Legendre polynomial; and residual effects. Heterogeneous residual variances were considered in the model. Estimates of variance components and genetic correlations among traits from MT-RR were compared with those estimated with a multiple trait interval (MT-I) model, which assumed that every 3-yr interval was a separate trait and included the same effects as in the MT-RR model except for the RR. Genetic correlations estimated with MT-RR and MT-I models over time among all traits were compared with correlations among breeding values predicted with the single trait (ST) model without RR. Correlations among breeding values predicted with MT-RR, ST, and MT models were also calculated. Additive genetic and residual variances for all traits except PL increased over time; those for PL were constant. As a result, heritability estimates had no significant changes during the 15 yr. Genetic correlations of PL with milk, fat, protein, and BSC declined to zero or negative; those with UDC remained positive. Correlations among breeding values predicted with ST, MT, and MT-RR models were relatively high for all traits except PL. Genetic correlations between PL and other traits varied over time, with some correlations changing sign. For accurate indirect prediction of PL from other traits, the genetic correlations among the traits need to be re-estimated periodically.
S Tsuruta; I Misztal; T J Lawlor
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  87     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2004 May 
Date Detail:
Created Date:  2004-08-04     Completed Date:  2004-09-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1457-68     Citation Subset:  IM    
Animal and Dairy Science Department, University of Georgia, Athens 30602, USA.
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MeSH Terms
Body Constitution / genetics*
Cattle / anatomy & histology,  genetics*,  physiology
Lactation / genetics*
Lipids / analysis
Mammary Glands, Animal / anatomy & histology*
Milk / chemistry*
Milk Proteins / analysis
Quantitative Trait, Heritable
Regression Analysis
Reg. No./Substance:
0/Lipids; 0/Milk Proteins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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