Frequency of recording and methods of estimation for selection on milk production

Detalhes bibliográficos
Autor(a) principal: Ledic, Ivan Luz
Data de Publicação: 1991
Outros Autores: Sobrinho, Evaristo Bianchini, Tupy, Oscar
Tipo de documento: Artigo
Idioma: por
Título da fonte: Pesquisa Agropecuária Brasileira (Online)
Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/3461
Resumo: Three milk-recording methods were compared using 1085 lactations from weekly controls, 1084 from biweekly, 1036 from monthly and 630 from bimonthly. The estimates of genetic parameters and the ranking of bulls were not much affected by the methods used for estimating total milk yield using weekly, biweekly and monthly frequency, anabling the choice among them to be made on basis of practical consideration. In view of the above results, bimonthly yield control is not recommended, because the genetic parameters estimated were null, and bull evaluation was greatly altered. The correlations between partial and total milk yield demonstrated that the latter may be estimated with increasing precision by the accumulated partial yield from the first four months of lactation.
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spelling Frequency of recording and methods of estimation for selection on milk productionFreqüência de registros e métodos de estimativa na seleção para produção de leitemilk recording; heritability; repeatibilitycontrole leiteiro; herdabilidade; repetibilidadeThree milk-recording methods were compared using 1085 lactations from weekly controls, 1084 from biweekly, 1036 from monthly and 630 from bimonthly. The estimates of genetic parameters and the ranking of bulls were not much affected by the methods used for estimating total milk yield using weekly, biweekly and monthly frequency, anabling the choice among them to be made on basis of practical consideration. In view of the above results, bimonthly yield control is not recommended, because the genetic parameters estimated were null, and bull evaluation was greatly altered. The correlations between partial and total milk yield demonstrated that the latter may be estimated with increasing precision by the accumulated partial yield from the first four months of lactation.Foram comparados três métodos de estimativa da produção total de leite de vacas da raça gir, utilizando 1.085 lactações com controles semanais, 1.084 com quinzenais, 1.036 com mensais e 630 com bimestrais. As estimativas de parâmetros genético-ambientais e a ordenação dos touros foi pouco alterada pelo método de estimação da produção de leite com controles semanais, quinzenais e mensais, podendo ficar, então, a escolha entre os métodos e freqüências apenas na dependência de considerações práticas. Não é aconselhável o uso de controles bimestrais, uma vez que os parâmetros genéticos estimados foram nulos e a avaliação dos touros do rebanho foi alterada, independentemente do método de estimação da produção de leite utilizado. As correlações entre produções parciais e a produção total de leite mostram que esta pode ser estimada, com precisão crescente, pelas produções parciais acumuladas nos quatro primeiros meses de lactação.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraLedic, Ivan LuzSobrinho, Evaristo BianchiniTupy, Oscar1991-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/3461Pesquisa Agropecuaria Brasileira; v.26, n.8, ago. 1991; 1227-1236Pesquisa Agropecuária Brasileira; v.26, n.8, ago. 1991; 1227-12361678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/3461/794info:eu-repo/semantics/openAccess2009-12-21T10:54:05Zoai:ojs.seer.sct.embrapa.br:article/3461Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2009-12-21T10:54:05Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Frequency of recording and methods of estimation for selection on milk production
Freqüência de registros e métodos de estimativa na seleção para produção de leite
title Frequency of recording and methods of estimation for selection on milk production
spellingShingle Frequency of recording and methods of estimation for selection on milk production
Ledic, Ivan Luz
milk recording; heritability; repeatibility
controle leiteiro; herdabilidade; repetibilidade
title_short Frequency of recording and methods of estimation for selection on milk production
title_full Frequency of recording and methods of estimation for selection on milk production
title_fullStr Frequency of recording and methods of estimation for selection on milk production
title_full_unstemmed Frequency of recording and methods of estimation for selection on milk production
title_sort Frequency of recording and methods of estimation for selection on milk production
author Ledic, Ivan Luz
author_facet Ledic, Ivan Luz
Sobrinho, Evaristo Bianchini
Tupy, Oscar
author_role author
author2 Sobrinho, Evaristo Bianchini
Tupy, Oscar
author2_role author
author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Ledic, Ivan Luz
Sobrinho, Evaristo Bianchini
Tupy, Oscar
dc.subject.por.fl_str_mv milk recording; heritability; repeatibility
controle leiteiro; herdabilidade; repetibilidade
topic milk recording; heritability; repeatibility
controle leiteiro; herdabilidade; repetibilidade
description Three milk-recording methods were compared using 1085 lactations from weekly controls, 1084 from biweekly, 1036 from monthly and 630 from bimonthly. The estimates of genetic parameters and the ranking of bulls were not much affected by the methods used for estimating total milk yield using weekly, biweekly and monthly frequency, anabling the choice among them to be made on basis of practical consideration. In view of the above results, bimonthly yield control is not recommended, because the genetic parameters estimated were null, and bull evaluation was greatly altered. The correlations between partial and total milk yield demonstrated that the latter may be estimated with increasing precision by the accumulated partial yield from the first four months of lactation.
publishDate 1991
dc.date.none.fl_str_mv 1991-08-01
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/3461
url https://seer.sct.embrapa.br/index.php/pab/article/view/3461
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/3461/794
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
dc.source.none.fl_str_mv Pesquisa Agropecuaria Brasileira; v.26, n.8, ago. 1991; 1227-1236
Pesquisa Agropecuária Brasileira; v.26, n.8, ago. 1991; 1227-1236
1678-3921
0100-104x
reponame:Pesquisa Agropecuária Brasileira (Online)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Pesquisa Agropecuária Brasileira (Online)
collection Pesquisa Agropecuária Brasileira (Online)
repository.name.fl_str_mv Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv pab@sct.embrapa.br || sct.pab@embrapa.br
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