Document Detail

Relationships of sire predicted transmitting ability for somatic cell score with measures of daughter performance.
MedLine Citation:
PMID:  11417710     Owner:  NLM     Status:  MEDLINE    
The relationship between sire predicted transmitting ability (PTA) for somatic cell score (SCS) and occurrence of mastitis in daughters was characterized with 304 Holsteins first freshening since 1991 in the Virginia Tech dairy herd. No direct sire selection for PTA SCS was practiced in the herd. Linear regressions of first lactation average SCS (1.3), number of cases of mastitis (0.80), days clinical (7.0), and number of treatments for mastitis (2.0) on PTA SCS were significant. Linear regression coefficients for second and third lactations were generally positive, but like quadratic and cubic coefficients in this study, were not significant. Relationship of sire PTA SCS and measures of lifetime (84 mo opportunity) performance were determined for 2,494,195 Holsteins born between 1979 and 1987. Linear coefficients from regression on PTA SCS for number of lactations (-0.31), days of productive life (-87.0), total days in milk (-72.2), lifetime milk (-1609.1), fat (-80.7), and protein (-48.2) production, relative net income adjusted for opportunity cost for fluid markets (+13.47), first lactation average SCS (+1.00), and first lactation mature equivalent milk (+429.9) were different from zero. Partial regressions holding PTA milk or PTA protein constant were substantially larger than linear coefficients. When PTA productive life was held constant, the relationship between PTA SCS and measures of herd life and lifetime yield became positive, and relative net income adjusted for opportunity cost variables became moderately positive. One of the major expenses associated with higher susceptibility (higher PTA SCS) may be shorter herd life.
J L Cranford; R E Pearson
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of dairy science     Volume:  84     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2001-06-21     Completed Date:  2001-11-01     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1501-7     Citation Subset:  IM    
Department of Dairy Science, Virginia Polytechnic Institute and State University, Blacksburg 24061, USA.
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MeSH Terms
Cattle / genetics*,  physiology
Cell Count / veterinary
Lactation / genetics*
Lipids / analysis
Mastitis, Bovine / epidemiology,  genetics*
Milk / chemistry,  cytology*
Milk Proteins / 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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