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Genetic relationships among mastitis and alternative somatic cell count traits in the first 3 lactations of Swedish Holsteins

The objectives of this study were to estimate heritabilities of, and genetic correlations among, clinical mastitis (CM), subclinical mastitis (SCM), and alternative somatic cell count (SCC) traits in the first 3 lactations of Swedish Holstein cows, and to estimate genetic correlations for the altern...

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Published in:Journal of dairy science 2012-06, Vol.95 (6), p.3428-3434
Main Authors: Urioste, J.I., Franzén, J., Windig, J.J., Strandberg, E.
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description The objectives of this study were to estimate heritabilities of, and genetic correlations among, clinical mastitis (CM), subclinical mastitis (SCM), and alternative somatic cell count (SCC) traits in the first 3 lactations of Swedish Holstein cows, and to estimate genetic correlations for the alternative traits across lactations. Data from cows having their first calving between 2002 and 2009 were used. The alternative SCC traits were based on information on CM and monthly test-day (TD) records of SCC traits of 178,613, 116,079, and 64,474 lactations in first, second, or third parity, respectively. Sires had an average of 230, 165, or 124 daughters in the data (parities 1, 2, or 3, respectively). Subclinical mastitis was defined as the number of periods with an SCC >150,000 cell/mL and without a treatment for CM. Average TD SCC between 5 and 150 d was used as a reference trait. The alternative SCC traits analyzed were 1) presence of at least 1 TD SCC between 41,000 and 80,000 cell/mL (TD41–80), 2) at least 1 TD SCC >500,000 cells/mL, 3) standard deviation of log SCC over the lactation, 4) number of infection peaks, and 5) average days diseased per peak. The same variables in different parities were treated as distinct traits. The statistical model considered the effects of herd-year, year, month, age at calving, animal, and residual. Heritability estimates were 0.07 to 0.08 for CM, 0.12 to 0.17 for SCM, and 0.14 for SCC150. For the alternative traits, heritability estimates were 0.12 to 0.17 for standard deviation of log SCC, TD SCC >500,000 cells/mL, and average days diseased per peak, and 0.06 to 0.10 for TD41–80 and number of infection peaks. Genetic correlations between CM with SCM were 0.62 to 0.74, and correlations for these traits with the alternative SCC traits were positive and very high (0.67 to 0.82 for CM, and 0.94 to 0.99 for SCM). Trait TD41–80 was the only alternative trait that showed negative, favorable, genetic correlations with CM (−0.22 to −0.50) and SCM (−0.48 to −0.85) because it is associated with healthy cows. Genetic correlations among the alternative traits in all 3 parities were high (0.93 to 0.99, 0.92 to 0.98, and 0.78 to 0.99, respectively). The only exception was TD41–80, which showed moderate to strong negative correlations with the rest of the traits. Genetic correlations of the same trait across parities were in general positive and very high (0.83 to 0.99). In conclusion, these alternative SCC traits could be used in prac
doi_str_mv 10.3168/jds.2011-4739
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Data from cows having their first calving between 2002 and 2009 were used. The alternative SCC traits were based on information on CM and monthly test-day (TD) records of SCC traits of 178,613, 116,079, and 64,474 lactations in first, second, or third parity, respectively. Sires had an average of 230, 165, or 124 daughters in the data (parities 1, 2, or 3, respectively). Subclinical mastitis was defined as the number of periods with an SCC &gt;150,000 cell/mL and without a treatment for CM. Average TD SCC between 5 and 150 d was used as a reference trait. The alternative SCC traits analyzed were 1) presence of at least 1 TD SCC between 41,000 and 80,000 cell/mL (TD41–80), 2) at least 1 TD SCC &gt;500,000 cells/mL, 3) standard deviation of log SCC over the lactation, 4) number of infection peaks, and 5) average days diseased per peak. The same variables in different parities were treated as distinct traits. The statistical model considered the effects of herd-year, year, month, age at calving, animal, and residual. Heritability estimates were 0.07 to 0.08 for CM, 0.12 to 0.17 for SCM, and 0.14 for SCC150. For the alternative traits, heritability estimates were 0.12 to 0.17 for standard deviation of log SCC, TD SCC &gt;500,000 cells/mL, and average days diseased per peak, and 0.06 to 0.10 for TD41–80 and number of infection peaks. Genetic correlations between CM with SCM were 0.62 to 0.74, and correlations for these traits with the alternative SCC traits were positive and very high (0.67 to 0.82 for CM, and 0.94 to 0.99 for SCM). Trait TD41–80 was the only alternative trait that showed negative, favorable, genetic correlations with CM (−0.22 to −0.50) and SCM (−0.48 to −0.85) because it is associated with healthy cows. Genetic correlations among the alternative traits in all 3 parities were high (0.93 to 0.99, 0.92 to 0.98, and 0.78 to 0.99, respectively). 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Psychology ; genetic parameter ; Genetics and Breeding ; Genetik och förädling ; Lactation - genetics ; Male ; mastitis ; Mastitis, Bovine - genetics ; Milk - cytology ; Milk and cheese industries. Ice creams ; norwegian red cows ; parameters ; Parity ; Pregnancy ; Quantitative Trait, Heritable ; score ; selection ; somatic cell count ; subclinical mastitis ; Sweden ; Terrestrial animal productions ; Vertebrates</subject><ispartof>Journal of dairy science, 2012-06, Vol.95 (6), p.3428-3434</ispartof><rights>2012 American Dairy Science Association</rights><rights>2015 INIST-CNRS</rights><rights>Copyright © 2012 American Dairy Science Association. Published by Elsevier Inc. 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Psychology</subject><subject>genetic parameter</subject><subject>Genetics and Breeding</subject><subject>Genetik och förädling</subject><subject>Lactation - genetics</subject><subject>Male</subject><subject>mastitis</subject><subject>Mastitis, Bovine - genetics</subject><subject>Milk - cytology</subject><subject>Milk and cheese industries. 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Ice creams</topic><topic>norwegian red cows</topic><topic>parameters</topic><topic>Parity</topic><topic>Pregnancy</topic><topic>Quantitative Trait, Heritable</topic><topic>score</topic><topic>selection</topic><topic>somatic cell count</topic><topic>subclinical mastitis</topic><topic>Sweden</topic><topic>Terrestrial animal productions</topic><topic>Vertebrates</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Urioste, J.I.</creatorcontrib><creatorcontrib>Franzén, J.</creatorcontrib><creatorcontrib>Windig, J.J.</creatorcontrib><creatorcontrib>Strandberg, E.</creatorcontrib><creatorcontrib>Sveriges lantbruksuniversitet</creatorcontrib><collection>ScienceDirect Open Access Titles</collection><collection>Elsevier:ScienceDirect:Open Access</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>MEDLINE - Academic</collection><collection>SwePub</collection><collection>SwePub Articles</collection><collection>NARCIS:Publications</collection><jtitle>Journal of dairy science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Urioste, J.I.</au><au>Franzén, J.</au><au>Windig, J.J.</au><au>Strandberg, E.</au><aucorp>Sveriges lantbruksuniversitet</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Genetic relationships among mastitis and alternative somatic cell count traits in the first 3 lactations of Swedish Holsteins</atitle><jtitle>Journal of dairy science</jtitle><addtitle>J Dairy Sci</addtitle><date>2012-06-01</date><risdate>2012</risdate><volume>95</volume><issue>6</issue><spage>3428</spage><epage>3434</epage><pages>3428-3434</pages><issn>0022-0302</issn><issn>1525-3198</issn><eissn>1525-3198</eissn><coden>JDSCAE</coden><abstract>The objectives of this study were to estimate heritabilities of, and genetic correlations among, clinical mastitis (CM), subclinical mastitis (SCM), and alternative somatic cell count (SCC) traits in the first 3 lactations of Swedish Holstein cows, and to estimate genetic correlations for the alternative traits across lactations. Data from cows having their first calving between 2002 and 2009 were used. The alternative SCC traits were based on information on CM and monthly test-day (TD) records of SCC traits of 178,613, 116,079, and 64,474 lactations in first, second, or third parity, respectively. Sires had an average of 230, 165, or 124 daughters in the data (parities 1, 2, or 3, respectively). Subclinical mastitis was defined as the number of periods with an SCC &gt;150,000 cell/mL and without a treatment for CM. Average TD SCC between 5 and 150 d was used as a reference trait. The alternative SCC traits analyzed were 1) presence of at least 1 TD SCC between 41,000 and 80,000 cell/mL (TD41–80), 2) at least 1 TD SCC &gt;500,000 cells/mL, 3) standard deviation of log SCC over the lactation, 4) number of infection peaks, and 5) average days diseased per peak. The same variables in different parities were treated as distinct traits. The statistical model considered the effects of herd-year, year, month, age at calving, animal, and residual. Heritability estimates were 0.07 to 0.08 for CM, 0.12 to 0.17 for SCM, and 0.14 for SCC150. For the alternative traits, heritability estimates were 0.12 to 0.17 for standard deviation of log SCC, TD SCC &gt;500,000 cells/mL, and average days diseased per peak, and 0.06 to 0.10 for TD41–80 and number of infection peaks. Genetic correlations between CM with SCM were 0.62 to 0.74, and correlations for these traits with the alternative SCC traits were positive and very high (0.67 to 0.82 for CM, and 0.94 to 0.99 for SCM). Trait TD41–80 was the only alternative trait that showed negative, favorable, genetic correlations with CM (−0.22 to −0.50) and SCM (−0.48 to −0.85) because it is associated with healthy cows. Genetic correlations among the alternative traits in all 3 parities were high (0.93 to 0.99, 0.92 to 0.98, and 0.78 to 0.99, respectively). The only exception was TD41–80, which showed moderate to strong negative correlations with the rest of the traits. Genetic correlations of the same trait across parities were in general positive and very high (0.83 to 0.99). In conclusion, these alternative SCC traits could be used in practical breeding programs aiming to improve udder health in dairy cattle.</abstract><cop>New York, NY</cop><pub>Elsevier Inc</pub><pmid>22612977</pmid><doi>10.3168/jds.2011-4739</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record>
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source ScienceDirect Journals; EZB Electronic Journals Library
subjects Animal productions
Animals
Biological and medical sciences
Cattle - genetics
Cattle - physiology
Cell Count - veterinary
clinical mastitis
dairy cattle
Female
Food industries
Fundamental and applied biological sciences. Psychology
genetic parameter
Genetics and Breeding
Genetik och förädling
Lactation - genetics
Male
mastitis
Mastitis, Bovine - genetics
Milk - cytology
Milk and cheese industries. Ice creams
norwegian red cows
parameters
Parity
Pregnancy
Quantitative Trait, Heritable
score
selection
somatic cell count
subclinical mastitis
Sweden
Terrestrial animal productions
Vertebrates
title Genetic relationships among mastitis and alternative somatic cell count traits in the first 3 lactations of Swedish Holsteins
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