Response to somatic cell count-based selection for mastitis resistance in a divergent selection experiment in sheep
A divergent selection experiment in sheep was implemented to study the consequences of log-transformed somatic cell score (SCS)-based selection on resistance to natural intramammary infections. Using dams and progeny-tested rams selected for extreme breeding values for SCS, we created 2 groups of ew...
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description | A divergent selection experiment in sheep was implemented to study the consequences of log-transformed somatic cell score (SCS)-based selection on resistance to natural intramammary infections. Using dams and progeny-tested rams selected for extreme breeding values for SCS, we created 2 groups of ewes with a strong divergence in SCS of approximately 3 genetic standard deviations. A survey of 84 first-lactation ewes of both the High and Low SCS lines indicated favorable responses to SCS-based selection on resistance to both clinical and subclinical mastitis. All clinical cases (n=5) occurred in the High SCS line. Additionally, the frequency of chronic clinical mastitis, as detected by the presence of parenchymal abscesses, was much greater in the High SCS line (n=21) than in the Low SCS line (n=1). According to monthly milk bacteriological examinations of udder halves, the prevalence of infection was significantly greater (odds ratio = 3.1) in the High SCS line than in the Low SCS line, with predicted probabilities of 37 and 16%, respectively. The most frequently isolated bacteria responsible for mastitis were staphylococci: Staphylococcus auricularis (42.6% of positive samples), Staphylococcus simulans, Staphylococcus haemoliticus, Staphylococcus xylosus, Staphylococcus chromogenes, Staphylococcus lentus, Staphylococcus warneri, and Staphylococcus aureus. The incidence of positive bacteriology was greater in the High SCS line (39%) than in the Low SCS line (12%) at lambing, indicating that High SCS line ewes were especially susceptible to postpartum subclinical mastitis. Negativation of bacteriological results from one sampling time point to the next was markedly different between lines after weaning (e.g., 41 and 84% in the High and Low SCS lines, respectively). This result was consistent with differences in the duration of infection, which was much greater in the High SCS line compared with the Low SCS line. Finally, ewes from the High SCS line consistently had greater SCS in positive milk samples than did ewes from the Low SCS line (+2.04 SCS, on average), with an especially large difference between lines during the suckling period (+3.42 SCS). Altogether, the preliminary results suggest that the better resistance of Low SCS line ewes, compared with High SCS line ewes, was principally characterized by a better ability to limit infections during the peripartum period, to eliminate infections during lactation, and quantitatively to limit the inflammation |
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Using dams and progeny-tested rams selected for extreme breeding values for SCS, we created 2 groups of ewes with a strong divergence in SCS of approximately 3 genetic standard deviations. A survey of 84 first-lactation ewes of both the High and Low SCS lines indicated favorable responses to SCS-based selection on resistance to both clinical and subclinical mastitis. All clinical cases (n=5) occurred in the High SCS line. Additionally, the frequency of chronic clinical mastitis, as detected by the presence of parenchymal abscesses, was much greater in the High SCS line (n=21) than in the Low SCS line (n=1). According to monthly milk bacteriological examinations of udder halves, the prevalence of infection was significantly greater (odds ratio = 3.1) in the High SCS line than in the Low SCS line, with predicted probabilities of 37 and 16%, respectively. The most frequently isolated bacteria responsible for mastitis were staphylococci: Staphylococcus auricularis (42.6% of positive samples), Staphylococcus simulans, Staphylococcus haemoliticus, Staphylococcus xylosus, Staphylococcus chromogenes, Staphylococcus lentus, Staphylococcus warneri, and Staphylococcus aureus. The incidence of positive bacteriology was greater in the High SCS line (39%) than in the Low SCS line (12%) at lambing, indicating that High SCS line ewes were especially susceptible to postpartum subclinical mastitis. Negativation of bacteriological results from one sampling time point to the next was markedly different between lines after weaning (e.g., 41 and 84% in the High and Low SCS lines, respectively). This result was consistent with differences in the duration of infection, which was much greater in the High SCS line compared with the Low SCS line. Finally, ewes from the High SCS line consistently had greater SCS in positive milk samples than did ewes from the Low SCS line (+2.04 SCS, on average), with an especially large difference between lines during the suckling period (+3.42 SCS). Altogether, the preliminary results suggest that the better resistance of Low SCS line ewes, compared with High SCS line ewes, was principally characterized by a better ability to limit infections during the peripartum period, to eliminate infections during lactation, and quantitatively to limit the inflammation process and its clinical consequences.</description><identifier>ISSN: 0022-0302</identifier><identifier>EISSN: 1525-3198</identifier><identifier>DOI: 10.3168/jds.2008-1435</identifier><identifier>PMID: 19233814</identifier><identifier>CODEN: JDSCAE</identifier><language>eng</language><publisher>New York, NY: Elsevier Inc</publisher><subject>Animal productions ; Animals ; Biological and medical sciences ; Breeding ; breeding value ; Cell Count ; dairy animals ; dairy sheep ; disease resistance ; divergent selection ; divergent selection experiment ; ewes ; Female ; Food industries ; Fundamental and applied biological sciences. Psychology ; Immunity, Innate - genetics ; inflammation ; lactation ; line differences ; Logistic Models ; Male ; Mammary Glands, Animal - microbiology ; mastitis ; Mastitis - microbiology ; Mastitis - veterinary ; Milk - cytology ; Milk - microbiology ; Milk and cheese industries. Ice creams ; Selection, Genetic ; Sheep - genetics ; Sheep Diseases - microbiology ; somatic cell count ; Staphylococcus ; Terrestrial animal productions ; Vertebrates</subject><ispartof>Journal of dairy science, 2009-03, Vol.92 (3), p.1203-1219</ispartof><rights>2009 American Dairy Science Association</rights><rights>2009 INIST-CNRS</rights><rights>Copyright American Dairy Science Association Mar 2009</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c490t-e70eb9be2ae65890df86f0350b4fc74b90c710e806532aa3304661e0d7b1c6e23</citedby><cites>FETCH-LOGICAL-c490t-e70eb9be2ae65890df86f0350b4fc74b90c710e806532aa3304661e0d7b1c6e23</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.3168/jds.2008-1435$$EHTML$$P50$$Gelsevier$$Hfree_for_read</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=21261686$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/19233814$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Rupp, R.</creatorcontrib><creatorcontrib>Bergonier, D.</creatorcontrib><creatorcontrib>Dion, S.</creatorcontrib><creatorcontrib>Hygonenq, M.C.</creatorcontrib><creatorcontrib>Aurel, M.R.</creatorcontrib><creatorcontrib>Robert-Granié, C.</creatorcontrib><creatorcontrib>Foucras, G.</creatorcontrib><title>Response to somatic cell count-based selection for mastitis resistance in a divergent selection experiment in sheep</title><title>Journal of dairy science</title><addtitle>J Dairy Sci</addtitle><description>A divergent selection experiment in sheep was implemented to study the consequences of log-transformed somatic cell score (SCS)-based selection on resistance to natural intramammary infections. Using dams and progeny-tested rams selected for extreme breeding values for SCS, we created 2 groups of ewes with a strong divergence in SCS of approximately 3 genetic standard deviations. A survey of 84 first-lactation ewes of both the High and Low SCS lines indicated favorable responses to SCS-based selection on resistance to both clinical and subclinical mastitis. All clinical cases (n=5) occurred in the High SCS line. Additionally, the frequency of chronic clinical mastitis, as detected by the presence of parenchymal abscesses, was much greater in the High SCS line (n=21) than in the Low SCS line (n=1). According to monthly milk bacteriological examinations of udder halves, the prevalence of infection was significantly greater (odds ratio = 3.1) in the High SCS line than in the Low SCS line, with predicted probabilities of 37 and 16%, respectively. The most frequently isolated bacteria responsible for mastitis were staphylococci: Staphylococcus auricularis (42.6% of positive samples), Staphylococcus simulans, Staphylococcus haemoliticus, Staphylococcus xylosus, Staphylococcus chromogenes, Staphylococcus lentus, Staphylococcus warneri, and Staphylococcus aureus. The incidence of positive bacteriology was greater in the High SCS line (39%) than in the Low SCS line (12%) at lambing, indicating that High SCS line ewes were especially susceptible to postpartum subclinical mastitis. Negativation of bacteriological results from one sampling time point to the next was markedly different between lines after weaning (e.g., 41 and 84% in the High and Low SCS lines, respectively). This result was consistent with differences in the duration of infection, which was much greater in the High SCS line compared with the Low SCS line. Finally, ewes from the High SCS line consistently had greater SCS in positive milk samples than did ewes from the Low SCS line (+2.04 SCS, on average), with an especially large difference between lines during the suckling period (+3.42 SCS). Altogether, the preliminary results suggest that the better resistance of Low SCS line ewes, compared with High SCS line ewes, was principally characterized by a better ability to limit infections during the peripartum period, to eliminate infections during lactation, and quantitatively to limit the inflammation process and its clinical consequences.</description><subject>Animal productions</subject><subject>Animals</subject><subject>Biological and medical sciences</subject><subject>Breeding</subject><subject>breeding value</subject><subject>Cell Count</subject><subject>dairy animals</subject><subject>dairy sheep</subject><subject>disease resistance</subject><subject>divergent selection</subject><subject>divergent selection experiment</subject><subject>ewes</subject><subject>Female</subject><subject>Food industries</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Immunity, Innate - genetics</subject><subject>inflammation</subject><subject>lactation</subject><subject>line differences</subject><subject>Logistic Models</subject><subject>Male</subject><subject>Mammary Glands, Animal - microbiology</subject><subject>mastitis</subject><subject>Mastitis - microbiology</subject><subject>Mastitis - veterinary</subject><subject>Milk - cytology</subject><subject>Milk - microbiology</subject><subject>Milk and cheese industries. Ice creams</subject><subject>Selection, Genetic</subject><subject>Sheep - genetics</subject><subject>Sheep Diseases - microbiology</subject><subject>somatic cell count</subject><subject>Staphylococcus</subject><subject>Terrestrial animal productions</subject><subject>Vertebrates</subject><issn>0022-0302</issn><issn>1525-3198</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNp1kd2L1DAUxYso7rr66KsGQd-63iRN2jwui1-wIKj7HNL0diZD24y5mVX_e1NmcEXwKST87sk951TVcw6Xkuvu7W6gSwHQ1byR6kF1zpVQteSme1idAwhRgwRxVj0h2pUrF6AeV2fcCCk73pxX9AVpHxdCliOjOLscPPM4TczHw5Lr3hEOjHBCn0Nc2BgTmx3lkAOxhBQou8UjCwtzbAh3mDa45L8G8OceU5jXx8LQFnH_tHo0uonw2em8qG7fv_t2_bG--fzh0_XVTe0bA7nGFrA3PQqHWnUGhrHTI0gFfTP6tukN-JYDdqCVFM5JCY3WHGFoe-41CnlRvTnq7lP8fkDKdg60enMLxgNZrY1SZaiAr_4Bd_GQlrKb5UZ1JcyWF6g-Qj5FooSj3RdfLv2yHOxahS1V2LUKu1ZR-Bcn0UM_43BPn7IvwOsT4Mi7aUwlyEB_uNKVLqr63sY2bLY_QkJLs5umIsvXL42w0pZeZQFfHsHRRes2qYjdfhXAJXBlVGtWD-2RwBL7XcBkyQcs_Q1F1mc7xPAfN78BZZ27Mg</recordid><startdate>20090301</startdate><enddate>20090301</enddate><creator>Rupp, R.</creator><creator>Bergonier, D.</creator><creator>Dion, S.</creator><creator>Hygonenq, M.C.</creator><creator>Aurel, M.R.</creator><creator>Robert-Granié, C.</creator><creator>Foucras, G.</creator><general>Elsevier Inc</general><general>American Dairy Science Association</general><general>Am Dairy Sci Assoc</general><general>Elsevier</general><scope>6I.</scope><scope>AAFTH</scope><scope>FBQ</scope><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7X2</scope><scope>7X7</scope><scope>7XB</scope><scope>88E</scope><scope>8FE</scope><scope>8FG</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>L6V</scope><scope>M0K</scope><scope>M0S</scope><scope>M1P</scope><scope>M7S</scope><scope>PATMY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>PYCSY</scope><scope>S0X</scope><scope>7X8</scope></search><sort><creationdate>20090301</creationdate><title>Response to somatic cell count-based selection for mastitis resistance in a divergent selection experiment in sheep</title><author>Rupp, R. ; Bergonier, D. ; Dion, S. ; Hygonenq, M.C. ; Aurel, M.R. ; Robert-Granié, C. ; Foucras, G.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c490t-e70eb9be2ae65890df86f0350b4fc74b90c710e806532aa3304661e0d7b1c6e23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Animal productions</topic><topic>Animals</topic><topic>Biological and medical sciences</topic><topic>Breeding</topic><topic>breeding value</topic><topic>Cell Count</topic><topic>dairy animals</topic><topic>dairy sheep</topic><topic>disease resistance</topic><topic>divergent selection</topic><topic>divergent selection experiment</topic><topic>ewes</topic><topic>Female</topic><topic>Food industries</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Immunity, Innate - genetics</topic><topic>inflammation</topic><topic>lactation</topic><topic>line differences</topic><topic>Logistic Models</topic><topic>Male</topic><topic>Mammary Glands, Animal - microbiology</topic><topic>mastitis</topic><topic>Mastitis - microbiology</topic><topic>Mastitis - veterinary</topic><topic>Milk - cytology</topic><topic>Milk - microbiology</topic><topic>Milk and cheese industries. Ice creams</topic><topic>Selection, Genetic</topic><topic>Sheep - genetics</topic><topic>Sheep Diseases - microbiology</topic><topic>somatic cell count</topic><topic>Staphylococcus</topic><topic>Terrestrial animal productions</topic><topic>Vertebrates</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Rupp, R.</creatorcontrib><creatorcontrib>Bergonier, D.</creatorcontrib><creatorcontrib>Dion, S.</creatorcontrib><creatorcontrib>Hygonenq, M.C.</creatorcontrib><creatorcontrib>Aurel, M.R.</creatorcontrib><creatorcontrib>Robert-Granié, C.</creatorcontrib><creatorcontrib>Foucras, G.</creatorcontrib><collection>ScienceDirect Open Access Titles</collection><collection>Elsevier:ScienceDirect:Open Access</collection><collection>AGRIS</collection><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Agricultural Science Collection</collection><collection>Health & Medical Collection</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Medical Database (Alumni Edition)</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Natural Science Collection</collection><collection>Hospital Premium Collection</collection><collection>Hospital Premium Collection (Alumni Edition)</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>Agricultural & Environmental Science Collection</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>Natural Science Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>Health Research Premium Collection</collection><collection>Health Research Premium Collection (Alumni)</collection><collection>ProQuest Central Student</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Health & Medical Complete (Alumni)</collection><collection>ProQuest Engineering Collection</collection><collection>Agricultural Science Database</collection><collection>Health & Medical Collection (Alumni Edition)</collection><collection>Medical Database</collection><collection>Engineering Database</collection><collection>Environmental Science Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>Environmental Science Collection</collection><collection>SIRS Editorial</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of dairy science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Rupp, R.</au><au>Bergonier, D.</au><au>Dion, S.</au><au>Hygonenq, M.C.</au><au>Aurel, M.R.</au><au>Robert-Granié, C.</au><au>Foucras, G.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Response to somatic cell count-based selection for mastitis resistance in a divergent selection experiment in sheep</atitle><jtitle>Journal of dairy science</jtitle><addtitle>J Dairy Sci</addtitle><date>2009-03-01</date><risdate>2009</risdate><volume>92</volume><issue>3</issue><spage>1203</spage><epage>1219</epage><pages>1203-1219</pages><issn>0022-0302</issn><eissn>1525-3198</eissn><coden>JDSCAE</coden><abstract>A divergent selection experiment in sheep was implemented to study the consequences of log-transformed somatic cell score (SCS)-based selection on resistance to natural intramammary infections. Using dams and progeny-tested rams selected for extreme breeding values for SCS, we created 2 groups of ewes with a strong divergence in SCS of approximately 3 genetic standard deviations. A survey of 84 first-lactation ewes of both the High and Low SCS lines indicated favorable responses to SCS-based selection on resistance to both clinical and subclinical mastitis. All clinical cases (n=5) occurred in the High SCS line. Additionally, the frequency of chronic clinical mastitis, as detected by the presence of parenchymal abscesses, was much greater in the High SCS line (n=21) than in the Low SCS line (n=1). According to monthly milk bacteriological examinations of udder halves, the prevalence of infection was significantly greater (odds ratio = 3.1) in the High SCS line than in the Low SCS line, with predicted probabilities of 37 and 16%, respectively. The most frequently isolated bacteria responsible for mastitis were staphylococci: Staphylococcus auricularis (42.6% of positive samples), Staphylococcus simulans, Staphylococcus haemoliticus, Staphylococcus xylosus, Staphylococcus chromogenes, Staphylococcus lentus, Staphylococcus warneri, and Staphylococcus aureus. The incidence of positive bacteriology was greater in the High SCS line (39%) than in the Low SCS line (12%) at lambing, indicating that High SCS line ewes were especially susceptible to postpartum subclinical mastitis. Negativation of bacteriological results from one sampling time point to the next was markedly different between lines after weaning (e.g., 41 and 84% in the High and Low SCS lines, respectively). This result was consistent with differences in the duration of infection, which was much greater in the High SCS line compared with the Low SCS line. Finally, ewes from the High SCS line consistently had greater SCS in positive milk samples than did ewes from the Low SCS line (+2.04 SCS, on average), with an especially large difference between lines during the suckling period (+3.42 SCS). Altogether, the preliminary results suggest that the better resistance of Low SCS line ewes, compared with High SCS line ewes, was principally characterized by a better ability to limit infections during the peripartum period, to eliminate infections during lactation, and quantitatively to limit the inflammation process and its clinical consequences.</abstract><cop>New York, NY</cop><pub>Elsevier Inc</pub><pmid>19233814</pmid><doi>10.3168/jds.2008-1435</doi><tpages>17</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Animal productions Animals Biological and medical sciences Breeding breeding value Cell Count dairy animals dairy sheep disease resistance divergent selection divergent selection experiment ewes Female Food industries Fundamental and applied biological sciences. Psychology Immunity, Innate - genetics inflammation lactation line differences Logistic Models Male Mammary Glands, Animal - microbiology mastitis Mastitis - microbiology Mastitis - veterinary Milk - cytology Milk - microbiology Milk and cheese industries. Ice creams Selection, Genetic Sheep - genetics Sheep Diseases - microbiology somatic cell count Staphylococcus Terrestrial animal productions Vertebrates |
title | Response to somatic cell count-based selection for mastitis resistance in a divergent selection experiment in sheep |
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