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Genetic analysis for mastitis resistance and milk somatic cell score in French Lacaune dairy sheep.
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MedLine Citation:
PMID:  11559483     Owner:  NLM     Status:  MEDLINE    
Genetic analysis for mastitis resistance was studied from two data sets. Firstly, risk factors for different mastitis traits, i.e. culling due to clinical or chronic mastitis and subclinical mastitis predicted from somatic cell count (SCC), were explored using data from 957 first lactation Lacaune ewes of an experimental INRA flock composed of two divergent lines for milk yield. Secondly, genetic parameters for SCC were estimated from 5 272 first lactation Lacaune ewes recorded among 38 flocks, using an animal model. In the experimental flock, the frequency of culling due to clinical mastitis (5% ) was lower than that of subclinical mastitis (10% ) predicted from SCC. Predicted subclinical mastitis was unfavourably associated with the milk yield level. Such an antagonism was not detected for clinical mastitis, which could result, to some extent, from its low frequency or from the limited amount of data. In practice, however, selection for mastitis resistance could be limited in a first approach to selection against subclinical mastitis using SCC. The heritability estimate of SCC was 0.15 for the lactation mean trait and varied from 0.04 to 0.12 from the first to the fifth test-day. The genetic correlation between lactation SCC and milk yield was slightly positive (0.15) but showed a strong evolution during lactation, i.e. from favourable (-0.48) to antagonistic (0.27). On a lactation basis, our results suggest that selection for mastitis resistance based on SCC is feasible. Patterns for genetic parameters within first lactation, however, require further confirmation and investigation.
F Barillet; R Rupp; S Mignon-Grasteau; J M Astruc; M Jacquin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Genetics, selection, evolution : GSE     Volume:  33     ISSN:  0999-193X     ISO Abbreviation:  Genet. Sel. Evol.     Publication Date:    2001 Jul-Aug
Date Detail:
Created Date:  2001-09-17     Completed Date:  2001-10-18     Revised Date:  2009-07-06    
Medline Journal Info:
Nlm Unique ID:  9114088     Medline TA:  Genet Sel Evol     Country:  France    
Other Details:
Languages:  eng     Pagination:  397-415     Citation Subset:  IM    
Station d'amélioration des animaux, Institut national de la recherche agronomique, BP 27, 31326 Castanet-Tolosan Cedex, France.
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MeSH Terms
Genetic Variation
Lactation / genetics*,  physiology
Mammary Glands, Animal / physiology
Mastitis / genetics*,  microbiology,  prevention & control
Milk / cytology
Risk Factors
Sheep / genetics*
Staphylococcus / pathogenicity

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

Full Text
Journal Information
Journal ID (nlm-ta): Genet Sel Evol
ISSN: 0999-193X
ISSN: 1297-9686
Publisher: BioMed Central
Article Information
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Copyright © 2001 INRA, EDP Sciences
Received Day: 14 Month: 9 Year: 2000
Accepted Day: 13 Month: 2 Year: 2001
collection publication date: Year: 2001
Electronic publication date: Day: 15 Month: 7 Year: 2001
Volume: 33 Issue: 4
First Page: 397 Last Page: 415
ID: 2705413
Publisher Id: 1297-9686-33-4-397
PubMed Id: 11559483
DOI: 10.1186/1297-9686-33-4-397

Genetic analysis for mastitis resistance and milk somatic cell score in French Lacaune dairy sheep
Francis Barillet1 Email:
Rachel Rupp2
Sandrine Mignon-Grasteau13
Jean-Michel Astruc4
Michèle Jacquin1
1Station d'amélioration des animaux, Institut national de la recherche agronomique, BP 27, 31326 Castanet-Tolosan Cedex, France
2Station de génétique quantitative et appliquée, Institut national de la recherche agronomique, 78352 Jouy-en-Josas Cedex, France
3Station de recherches avicoles, Institut national de la recherche agronomique, 37380 Nouzilly, France
4Institut de l'élevage, BP 18, 31321 Castanet-Tolosan Cedex, France

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Article Categories:
  • Research

Keywords: dairy sheep, somatic cell count, mastitis, genetic parameters, risk factors.

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