Changing Definition of Productive Life in US Holsteins: Effect on Genetic Correlations
Data included 392,800 records for cows born between 1995 and 1997. Traits analyzed were milk, fat, and protein yields, somatic cell score, days open (DO), 18 linear type traits, final score, and several measures of longevity. Productive life (PL) was defined as the total number of days in milk up to...
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| Veröffentlicht in: | Journal of dairy science 2005-03, Vol.88 (3), p.1156-1165 |
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| creator | Tsuruta, S Misztal, I Lawlor, T. J |
| description | Data included 392,800 records for cows born between 1995 and 1997. Traits analyzed were milk, fat, and protein yields, somatic cell score, days open (DO), 18 linear type traits, final score, and several measures of longevity. Productive life (PL) was defined as the total number of days in milk up to 84 mo of age with a restriction of 305, 500, or 999 d per lactation (PL305, PL500, or PL999, respectively). Herd life was defined as the total number of days from the first calving date to the last (culling) date. A multiple-trait sire model including the effects of registration status, herd-year, age group, month of calving and stage of lactation, sire, and residual was used for parameter estimation. The average duration of the first lactation was 365 d for survivors and 386 d for culled cows. Lactation lengths for the survivors in the next 3 parities all exceeded 330 d. Heritability estimates of between 0.08 and 0.10 were obtained for all definitions of longevity. As maximum recordable PL was increased from 305 to 999 d per lactation, the genetic correlations with milk production increased (from −0.11 to +0.14) and with DO decreased (−0.62 to −0.27). Formulas for an indirect prediction of PL from correlated traits were developed. As maximum PL per lactation was increased, little change in the weights used to predict the various measures of PL, with the exception of DO was found. As the currently used value of PL305 does not properly account for the longer lactation lengths that are routinely occurring with today's cows, PL with longer lactations may be preferable in routine evaluation. |
| doi_str_mv | 10.3168/jds.s0022-0302(05)72782-x |
| format | Article |
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J</creator><creatorcontrib>Tsuruta, S ; Misztal, I ; Lawlor, T. J</creatorcontrib><description>Data included 392,800 records for cows born between 1995 and 1997. Traits analyzed were milk, fat, and protein yields, somatic cell score, days open (DO), 18 linear type traits, final score, and several measures of longevity. Productive life (PL) was defined as the total number of days in milk up to 84 mo of age with a restriction of 305, 500, or 999 d per lactation (PL305, PL500, or PL999, respectively). Herd life was defined as the total number of days from the first calving date to the last (culling) date. A multiple-trait sire model including the effects of registration status, herd-year, age group, month of calving and stage of lactation, sire, and residual was used for parameter estimation. The average duration of the first lactation was 365 d for survivors and 386 d for culled cows. Lactation lengths for the survivors in the next 3 parities all exceeded 330 d. Heritability estimates of between 0.08 and 0.10 were obtained for all definitions of longevity. As maximum recordable PL was increased from 305 to 999 d per lactation, the genetic correlations with milk production increased (from −0.11 to +0.14) and with DO decreased (−0.62 to −0.27). Formulas for an indirect prediction of PL from correlated traits were developed. As maximum PL per lactation was increased, little change in the weights used to predict the various measures of PL, with the exception of DO was found. As the currently used value of PL305 does not properly account for the longer lactation lengths that are routinely occurring with today's cows, PL with longer lactations may be preferable in routine evaluation.</description><identifier>ISSN: 0022-0302</identifier><identifier>EISSN: 1525-3198</identifier><identifier>DOI: 10.3168/jds.s0022-0302(05)72782-x</identifier><identifier>PMID: 15738249</identifier><identifier>CODEN: JDSCAE</identifier><language>eng</language><publisher>Savoy, IL: Elsevier Inc</publisher><subject>Animal productions ; Animals ; Biological and medical sciences ; Breeding ; Cattle - genetics ; Cattle - physiology ; Cell Count - veterinary ; Female ; Food industries ; Fundamental and applied biological sciences. Psychology ; genetic correlation ; Lactation - genetics ; Lactation - physiology ; lactation length ; longevity ; Longevity - genetics ; Male ; Mathematics ; Milk - chemistry ; Milk - cytology ; Milk and cheese industries. Ice creams ; Parity - genetics ; Parity - physiology ; productive life ; Quantitative Trait, Heritable ; Reproduction - genetics ; Terrestrial animal productions ; Time Factors ; Vertebrates</subject><ispartof>Journal of dairy science, 2005-03, Vol.88 (3), p.1156-1165</ispartof><rights>2005 American Dairy Science Association</rights><rights>2005 INIST-CNRS</rights><rights>Copyright American Dairy Science Association Mar 2005</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c691t-fa42a9f9b88b16a5071608e5f15fb6f242222b48a35e053a241e9acff45ce34c3</citedby><cites>FETCH-LOGICAL-c691t-fa42a9f9b88b16a5071608e5f15fb6f242222b48a35e053a241e9acff45ce34c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.3168/jds.S0022-0302(05)72782-X$$EHTML$$P50$$Gelsevier$$Hfree_for_read</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=16575285$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/15738249$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Tsuruta, S</creatorcontrib><creatorcontrib>Misztal, I</creatorcontrib><creatorcontrib>Lawlor, T. J</creatorcontrib><title>Changing Definition of Productive Life in US Holsteins: Effect on Genetic Correlations</title><title>Journal of dairy science</title><addtitle>J Dairy Sci</addtitle><description>Data included 392,800 records for cows born between 1995 and 1997. Traits analyzed were milk, fat, and protein yields, somatic cell score, days open (DO), 18 linear type traits, final score, and several measures of longevity. Productive life (PL) was defined as the total number of days in milk up to 84 mo of age with a restriction of 305, 500, or 999 d per lactation (PL305, PL500, or PL999, respectively). Herd life was defined as the total number of days from the first calving date to the last (culling) date. A multiple-trait sire model including the effects of registration status, herd-year, age group, month of calving and stage of lactation, sire, and residual was used for parameter estimation. The average duration of the first lactation was 365 d for survivors and 386 d for culled cows. Lactation lengths for the survivors in the next 3 parities all exceeded 330 d. Heritability estimates of between 0.08 and 0.10 were obtained for all definitions of longevity. As maximum recordable PL was increased from 305 to 999 d per lactation, the genetic correlations with milk production increased (from −0.11 to +0.14) and with DO decreased (−0.62 to −0.27). Formulas for an indirect prediction of PL from correlated traits were developed. As maximum PL per lactation was increased, little change in the weights used to predict the various measures of PL, with the exception of DO was found. As the currently used value of PL305 does not properly account for the longer lactation lengths that are routinely occurring with today's cows, PL with longer lactations may be preferable in routine evaluation.</description><subject>Animal productions</subject><subject>Animals</subject><subject>Biological and medical sciences</subject><subject>Breeding</subject><subject>Cattle - genetics</subject><subject>Cattle - physiology</subject><subject>Cell Count - veterinary</subject><subject>Female</subject><subject>Food industries</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>genetic correlation</subject><subject>Lactation - genetics</subject><subject>Lactation - physiology</subject><subject>lactation length</subject><subject>longevity</subject><subject>Longevity - genetics</subject><subject>Male</subject><subject>Mathematics</subject><subject>Milk - chemistry</subject><subject>Milk - cytology</subject><subject>Milk and cheese industries. Ice creams</subject><subject>Parity - genetics</subject><subject>Parity - physiology</subject><subject>productive life</subject><subject>Quantitative Trait, Heritable</subject><subject>Reproduction - genetics</subject><subject>Terrestrial animal productions</subject><subject>Time Factors</subject><subject>Vertebrates</subject><issn>0022-0302</issn><issn>1525-3198</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</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>eNqNkV-L1DAUxYso7rj6FTQKij50zZ-mTXyTuu4KAwrjiG8hTW9mMnSSNWlX_famzuCAL5qXS-B3z-WcUxRPCb5gpBavd326SBhTWmKG6UvMXzW0EbT8cadYEE55yYgUd4vFH-SseJDSLn8Jxfx-cUZ4wwSt5KL40m613zi_Qe_AOu9GFzwKFn2KoZ_M6G4BLZ0F5Dxar9B1GNIIzqc36NJaMCPK9BV4GJ1BbYgRBj0rpIfFPauHBI-O87xYv7_83F6Xy49XH9q3y9LUkoyl1RXV0spOiI7UmuOG1FgAt4Tbrra0ovl1ldCMA-ZM04qA1MbaihtglWHnxYuD7k0M3yZIo9q7ZGAYtIcwJVU3VcMazP4J5mQYobTO4LO_wF2Yos8mFJFcYNzUIkPyAJkYUopg1U10ex1_KoLVXJHKFanVnL-a81eYq98Vqa959_HxwNTtoT9tHjvJwPMjoJPRg43aG5dOXM0bTgU_Wdq6zfa7i6DSXg9DliXzeSEUU4Tw2dKTA2h1UHoTs9h6RTFhGEshhKwy0R4IyF3dOogqGQfeQJ9lzaj64P7D2S9kD8Wu</recordid><startdate>20050301</startdate><enddate>20050301</enddate><creator>Tsuruta, S</creator><creator>Misztal, I</creator><creator>Lawlor, T. 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Ice creams</topic><topic>Parity - genetics</topic><topic>Parity - physiology</topic><topic>productive life</topic><topic>Quantitative Trait, Heritable</topic><topic>Reproduction - genetics</topic><topic>Terrestrial animal productions</topic><topic>Time Factors</topic><topic>Vertebrates</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Tsuruta, S</creatorcontrib><creatorcontrib>Misztal, I</creatorcontrib><creatorcontrib>Lawlor, T. 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J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Changing Definition of Productive Life in US Holsteins: Effect on Genetic Correlations</atitle><jtitle>Journal of dairy science</jtitle><addtitle>J Dairy Sci</addtitle><date>2005-03-01</date><risdate>2005</risdate><volume>88</volume><issue>3</issue><spage>1156</spage><epage>1165</epage><pages>1156-1165</pages><issn>0022-0302</issn><eissn>1525-3198</eissn><coden>JDSCAE</coden><abstract>Data included 392,800 records for cows born between 1995 and 1997. Traits analyzed were milk, fat, and protein yields, somatic cell score, days open (DO), 18 linear type traits, final score, and several measures of longevity. Productive life (PL) was defined as the total number of days in milk up to 84 mo of age with a restriction of 305, 500, or 999 d per lactation (PL305, PL500, or PL999, respectively). Herd life was defined as the total number of days from the first calving date to the last (culling) date. A multiple-trait sire model including the effects of registration status, herd-year, age group, month of calving and stage of lactation, sire, and residual was used for parameter estimation. The average duration of the first lactation was 365 d for survivors and 386 d for culled cows. Lactation lengths for the survivors in the next 3 parities all exceeded 330 d. Heritability estimates of between 0.08 and 0.10 were obtained for all definitions of longevity. As maximum recordable PL was increased from 305 to 999 d per lactation, the genetic correlations with milk production increased (from −0.11 to +0.14) and with DO decreased (−0.62 to −0.27). Formulas for an indirect prediction of PL from correlated traits were developed. As maximum PL per lactation was increased, little change in the weights used to predict the various measures of PL, with the exception of DO was found. As the currently used value of PL305 does not properly account for the longer lactation lengths that are routinely occurring with today's cows, PL with longer lactations may be preferable in routine evaluation.</abstract><cop>Savoy, IL</cop><pub>Elsevier Inc</pub><pmid>15738249</pmid><doi>10.3168/jds.s0022-0302(05)72782-x</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Journal of dairy science, 2005-03, Vol.88 (3), p.1156-1165 |
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| subjects | Animal productions Animals Biological and medical sciences Breeding Cattle - genetics Cattle - physiology Cell Count - veterinary Female Food industries Fundamental and applied biological sciences. Psychology genetic correlation Lactation - genetics Lactation - physiology lactation length longevity Longevity - genetics Male Mathematics Milk - chemistry Milk - cytology Milk and cheese industries. Ice creams Parity - genetics Parity - physiology productive life Quantitative Trait, Heritable Reproduction - genetics Terrestrial animal productions Time Factors Vertebrates |
| title | Changing Definition of Productive Life in US Holsteins: Effect on Genetic Correlations |
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