{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,9]],"date-time":"2025-12-09T08:20:03Z","timestamp":1765268403254},"reference-count":39,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2016,12,1]],"date-time":"2016-12-01T00:00:00Z","timestamp":1480550400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100002322","name":"Coordena\u00e7\u00e3o de Aperfei\u00e7oamento de Pessoal de N\u00edvel Superior","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100002322","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Animal Breeding Genetics"],"published-print":{"date-parts":[[2017,2]]},"abstract":"<jats:title>Summary<\/jats:title><jats:p>The aim of this study was to estimate genetic parameters for prenatal (<jats:styled-content style=\"fixed-case\">PRE<\/jats:styled-content>) and postnatal (<jats:styled-content style=\"fixed-case\">POS<\/jats:styled-content>) mortality in Nellore cattle. A total of 13\u00a0141 (<jats:styled-content style=\"fixed-case\">PRE<\/jats:styled-content>) and 17\u00a0818 (<jats:styled-content style=\"fixed-case\">POS<\/jats:styled-content>) records from Nellore females were used. <jats:styled-content style=\"fixed-case\">PRE<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">POS<\/jats:styled-content> were recorded using binary scale scores: a score of \u20181\u2019 was given to calves that were born alive (<jats:styled-content style=\"fixed-case\">PRE<\/jats:styled-content>) and those that were alive at weaning (<jats:styled-content style=\"fixed-case\">POS<\/jats:styled-content>), and a score of \u20180\u2019 was given to calves that were not alive at or around birth (<jats:styled-content style=\"fixed-case\">PRE<\/jats:styled-content>), as well as to those weighed at birth but not at weaning (<jats:styled-content style=\"fixed-case\">POS<\/jats:styled-content>). The relationship matrix included 698 sires, 107 paternal grandsires and 69 maternal grandsires. Data were analysed using Bayesian inference and a sire\u2013maternal grandsire threshold model, including contemporary groups as random effects, and the classes of dam age at the beginning of mating season (for <jats:styled-content style=\"fixed-case\">PRE<\/jats:styled-content>), and dam age at calving and birthweight (linear covariable) (for <jats:styled-content style=\"fixed-case\">POS<\/jats:styled-content>), as fixed effects. For both traits, the covariance between direct and maternal effects (<jats:styled-content style=\"fixed-case\">r<jats:sub>D<\/jats:sub><\/jats:styled-content><jats:sub>,M<\/jats:sub>) was estimated (<jats:styled-content style=\"fixed-case\">r<jats:sub>D<\/jats:sub><\/jats:styled-content><jats:sub>,M<\/jats:sub>\u2260 0) or fixed at zero (<jats:styled-content style=\"fixed-case\">r<jats:sub>D<\/jats:sub><\/jats:styled-content><jats:sub>,M<\/jats:sub>\u00a0=\u00a00). <jats:styled-content style=\"fixed-case\">PRE<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">POS<\/jats:styled-content> rates were 3.00 and 4.04%, respectively. Estimates of direct and maternal heritability were 0.07 and 0.17, respectively, for <jats:styled-content style=\"fixed-case\">PRE<\/jats:styled-content>, and 0.02 and 0.07, respectively, for <jats:styled-content style=\"fixed-case\">POS<\/jats:styled-content>, assuming <jats:styled-content style=\"fixed-case\">r<jats:sub>D<\/jats:sub><\/jats:styled-content><jats:sub>,M<\/jats:sub>\u00a0=\u00a00. For <jats:styled-content style=\"fixed-case\">r<jats:sub>D<\/jats:sub><\/jats:styled-content><jats:sub>,M<\/jats:sub>\u00a0\u2260\u00a00, these estimates were 0.07 and 0.12, respectively, for <jats:styled-content style=\"fixed-case\">PRE<\/jats:styled-content>, and 0.03 and 0.07, respectively, for <jats:styled-content style=\"fixed-case\">POS<\/jats:styled-content>. The correlation estimates between direct and maternal effects were \u22120.71 (<jats:styled-content style=\"fixed-case\">PRE<\/jats:styled-content>) and \u22120.33 (<jats:styled-content style=\"fixed-case\">POS<\/jats:styled-content>). <jats:styled-content style=\"fixed-case\">PRE<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">POS<\/jats:styled-content> show low genetic variability, indicating that these traits probably suffer major environmental influences. Additionally, our study shows that the maternal genetic component affects preweaning calf mortality twice as much (or more) as the direct genetic component. A large number of offspring per sire is necessary in progeny tests to genetically decrease calf mortality.<\/jats:p>","DOI":"10.1111\/jbg.12246","type":"journal-article","created":{"date-parts":[[2016,12,1]],"date-time":"2016-12-01T06:36:44Z","timestamp":1480574204000},"page":"27-33","source":"Crossref","is-referenced-by-count":7,"title":["Genetic parameter estimates for prenatal and postnatal mortality in Nellore cattle"],"prefix":"10.1111","volume":"134","author":[{"given":"L.C.","family":"Magalh\u00e3es Silva","sequence":"first","affiliation":[{"name":"Departamento de Zootecnia Faculdade de Ci\u00eancias Agr\u00e1rias e Veterin\u00e1rias UNESP Jaboticabal\u2010SP Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"F.","family":"Baldi","sequence":"additional","affiliation":[{"name":"Departamento de Zootecnia Faculdade de Ci\u00eancias Agr\u00e1rias e Veterin\u00e1rias UNESP Jaboticabal\u2010SP Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"C.","family":"Aboujaoude","sequence":"additional","affiliation":[{"name":"Programa de P\u00f3s\u2010Gradua\u00e7\u00e3o em Gen\u00e9tica e Melhoramento Animal Faculdade de Ci\u00eancias Agr\u00e1rias e Veterin\u00e1rias UNESP Jaboticabal\u2010SP Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"G.C.","family":"Venturini","sequence":"additional","affiliation":[{"name":"Departamento de Zootecnia Faculdade de Ci\u00eancias Agr\u00e1rias e Veterin\u00e1rias UNESP Jaboticabal\u2010SP Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"L.G.","family":"Albuquerque","sequence":"additional","affiliation":[{"name":"Departamento de Zootecnia Faculdade de Ci\u00eancias Agr\u00e1rias e Veterin\u00e1rias UNESP Jaboticabal\u2010SP Brazil"},{"name":"Conselho Nacional de Desenvolvimento Cient\u00edfico e Tecnol\u00f3gico (CNPq) Bras\u00edlia\u2010DF Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M.J.R.","family":"Paranhos da Costa","sequence":"additional","affiliation":[{"name":"Departamento de Zootecnia Faculdade de Ci\u00eancias Agr\u00e1rias e Veterin\u00e1rias UNESP Jaboticabal\u2010SP Brazil"},{"name":"Conselho Nacional de Desenvolvimento Cient\u00edfico e Tecnol\u00f3gico (CNPq) Bras\u00edlia\u2010DF Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2016,12]]},"reference":[{"key":"e_1_2_6_2_1","first-page":"681","article-title":"Par\u00e2metros gen\u00e9ticos da viabilidade de bezerros em um rebanho Canchim","volume":"11","author":"Alencar M.M.","year":"1982","journal-title":"Rev. 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