Comparison of methods of estimation of lactation yield from monthly records
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , |
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/16663 |
Resumo: | Four methods of estimation of lactation yields were compared: Brazilian official method (Q); test interval method (T); T corrected for length of inicial interval (TI) and for initial and final intervals (TIF). Actual production (R =sum of daily yields) was used to measure errors of estimation. For 423 lactations (176 cows) corrected for environmental effects, correlation coefficients between actual and estimated production, by each of the Q, T, TI and TIF methods, were respectively: 0.98, 0.95, 0.95 and 0.94; and repeatabilities, 0.47, 0.46. 0.46 and 0.44 (standard error = 0.05). Cows were ranked by their MPPA calculated by each method. Rank correlation coefficients with actual rank were 0.98, 0.95, 0.96 and 0.95, for Q, T, TI and TIF, respectively. The ranking of six bulls on their predicted difference was not much affected by the method used for estimation. |
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Comparison of methods of estimation of lactation yield from monthly recordsComparação de métodos para estimar a produção de leite com base em controles mensaismilk recording; selection; milk production; repeatabilitycontrole leiteiro; seleção; produção de leite; repetibilidadeFour methods of estimation of lactation yields were compared: Brazilian official method (Q); test interval method (T); T corrected for length of inicial interval (TI) and for initial and final intervals (TIF). Actual production (R =sum of daily yields) was used to measure errors of estimation. For 423 lactations (176 cows) corrected for environmental effects, correlation coefficients between actual and estimated production, by each of the Q, T, TI and TIF methods, were respectively: 0.98, 0.95, 0.95 and 0.94; and repeatabilities, 0.47, 0.46. 0.46 and 0.44 (standard error = 0.05). Cows were ranked by their MPPA calculated by each method. Rank correlation coefficients with actual rank were 0.98, 0.95, 0.96 and 0.95, for Q, T, TI and TIF, respectively. The ranking of six bulls on their predicted difference was not much affected by the method used for estimation.Foram comparados quatro métodos de estimar a produção por lactação a partir de controles mensais: Oficial Brasileiro (Q); intervalo entre teste (T); T com correção pelo período inicial (TI); e com correção pelos períodos inicial e final (TIF). A produção real (R = soma das produções diárias) foi utilizada como padrão para medir os erros dos métodos de estimação. São apresentadas estatísticas sobre a distribuição destes erros. Para 425 lactações (176 vacas) corrigidas por efeitos de meio, os coeficientes de correlação entre a produção real e a estimada por cada um dos métodos Q, T, TI e TIF, foram, respectivamente: 0,98, 0,95, 0,95 e 0,94, e as repetibilidades, 0,47, 0,46, 0,46 e 0,44 (erro-padrão = 0,05). As vacas foram ordenadas pela CMPP calculada para cada método. Os coeficientes de correlação entre estas ordenações e a real, foram: 098, 0,95, 0,96 e 0,95, para Q, T, TI e TIF, respectivamente. A ordenação de seis touros pela diferença predita foi pouco alterada pelo método de estimação.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraMartinez, Mário LuizFreitas, Ary Ferreira deMadalena, Fernando Enrique2014-04-15info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/16663Pesquisa Agropecuaria Brasileira; v.14, n.2, fev. 1979; 117-122Pesquisa Agropecuária Brasileira; v.14, n.2, fev. 1979; 117-1221678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/16663/10969info:eu-repo/semantics/openAccess2014-04-15T19:23:20Zoai:ojs.seer.sct.embrapa.br:article/16663Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-04-15T19:23:20Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Comparison of methods of estimation of lactation yield from monthly records Comparação de métodos para estimar a produção de leite com base em controles mensais |
title |
Comparison of methods of estimation of lactation yield from monthly records |
spellingShingle |
Comparison of methods of estimation of lactation yield from monthly records Martinez, Mário Luiz milk recording; selection; milk production; repeatability controle leiteiro; seleção; produção de leite; repetibilidade |
title_short |
Comparison of methods of estimation of lactation yield from monthly records |
title_full |
Comparison of methods of estimation of lactation yield from monthly records |
title_fullStr |
Comparison of methods of estimation of lactation yield from monthly records |
title_full_unstemmed |
Comparison of methods of estimation of lactation yield from monthly records |
title_sort |
Comparison of methods of estimation of lactation yield from monthly records |
author |
Martinez, Mário Luiz |
author_facet |
Martinez, Mário Luiz Freitas, Ary Ferreira de Madalena, Fernando Enrique |
author_role |
author |
author2 |
Freitas, Ary Ferreira de Madalena, Fernando Enrique |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Martinez, Mário Luiz Freitas, Ary Ferreira de Madalena, Fernando Enrique |
dc.subject.por.fl_str_mv |
milk recording; selection; milk production; repeatability controle leiteiro; seleção; produção de leite; repetibilidade |
topic |
milk recording; selection; milk production; repeatability controle leiteiro; seleção; produção de leite; repetibilidade |
description |
Four methods of estimation of lactation yields were compared: Brazilian official method (Q); test interval method (T); T corrected for length of inicial interval (TI) and for initial and final intervals (TIF). Actual production (R =sum of daily yields) was used to measure errors of estimation. For 423 lactations (176 cows) corrected for environmental effects, correlation coefficients between actual and estimated production, by each of the Q, T, TI and TIF methods, were respectively: 0.98, 0.95, 0.95 and 0.94; and repeatabilities, 0.47, 0.46. 0.46 and 0.44 (standard error = 0.05). Cows were ranked by their MPPA calculated by each method. Rank correlation coefficients with actual rank were 0.98, 0.95, 0.96 and 0.95, for Q, T, TI and TIF, respectively. The ranking of six bulls on their predicted difference was not much affected by the method used for estimation. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-04-15 |
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/16663 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/16663 |
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/16663/10969 |
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.14, n.2, fev. 1979; 117-122 Pesquisa Agropecuária Brasileira; v.14, n.2, fev. 1979; 117-122 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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1793416673740455936 |