Document Detail

Impact of early lactation somatic cell count in heifers on somatic cell counts over the first lactation.
MedLine Citation:
PMID:  15483151     Owner:  NLM     Status:  MEDLINE    
The objective of this study was to estimate the impact of somatic cell count in early lactation (SCCel) from Belgian dairy heifers on test-day somatic cell count (SCC) in first lactation. Geometric mean SCCel [5 to 14 d in milk (DIM)] of the 14,766 available samples was 104,000 cells/mL, and decreased from 178,000 at 5 DIM to 74,000 cells/mL at 14 DIM. Proportion of SCCel >200,000 cells/mL was 27.5. Heifers calving in the period April-June had highest SCCel. In total, 117,496 monthly SCC were measured. A multilevel regression analysis revealed that an increase of the natural log-transformed SCCel (LnSCCel) by one unit on average resulted in an increase of test-day natural log-transformed SCC (LnSCC) by 0.22 unit. The impact of LnSCCel on LnSCC depended on when LnSCCel was measured; an elevated LnSCCel at 14 DIM was more consequential than an equally elevated LnSCCel at 5 DIM. The probability of having a test-day SCC >200,000 cells/mL during the first lactation, also increased with an increasing LnSCCel. The negative effect of an elevated LnSCCel was still present, although to a lesser extent, in heifers with a second test-day SCC <or=50,000 cells/mL. This study indicates that udder health problems in heifers in early lactation have a high prevalence and stresses that heifers should have a low SCCel, because an elevated SCCel will negatively influence test-day SCC during the whole first lactation.
S De Vliegher; H W Barkema; H Stryhn; G Opsomer; A de Kruif
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 Nov 
Date Detail:
Created Date:  2004-10-14     Completed Date:  2005-04-14     Revised Date:  2009-11-03    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3672-82     Citation Subset:  IM    
Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium. <>
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MeSH Terms
Cattle / physiology*
Cell Count / statistics & numerical data,  veterinary*
Dairying / methods,  statistics & numerical data
Lactation / physiology*
Mastitis, Bovine / epidemiology
Milk / cytology*
Odds Ratio
Regression Analysis
Time Factors

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

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