Fitting mathematical models to lactation curves from holstein cows in the southwestern region of the state of Parana, Brazil

Detalhes bibliográficos
Autor(a) principal: Ferreira,Abílio G.T.
Data de Publicação: 2015
Outros Autores: Henrique,Douglas S., Vieira,Ricardo A.M., Maeda,Emilyn M., Valotto,Altair A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Anais da Academia Brasileira de Ciências (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100503
Resumo: The objective of this study was to evaluate four mathematical models with regards to their fit to lactation curves of Holstein cows from herds raised in the southwestern region of the state of Parana, Brazil. Initially, 42,281 milk production records from 2005 to 2011 were obtained from "Associação Paranaense de Criadores de Bovinos da Raça Holandesa (APCBRH)". Data lacking dates of drying and total milk production at 305 days of lactation were excluded, resulting in a remaining 15,142 records corresponding to 2,441 Holstein cows. Data were sorted according to the parity order (ranging from one to six), and within each parity order the animals were divided into quartiles (Q25%, Q50%, Q75% and Q100%) corresponding to 305-day lactation yield. Within each parity order, for each quartile, four mathematical models were adjusted, two of which were predominantly empirical (Brody and Wood) whereas the other two presented more mechanistic characteristics (models Dijkstra and Pollott). The quality of fit was evaluated by the corrected Akaike information criterion. The Wood model showed the best fit in almost all evaluated situations and, therefore, may be considered as the most suitable model to describe, at least empirically, the lactation curves of Holstein cows raised in Southwestern Parana.
id ABC-1_15d1fb6a8635b60c7a5c4d7ba8a485b5
oai_identifier_str oai:scielo:S0001-37652015000100503
network_acronym_str ABC-1
network_name_str Anais da Academia Brasileira de Ciências (Online)
repository_id_str
spelling Fitting mathematical models to lactation curves from holstein cows in the southwestern region of the state of Parana, Brazildairy cattlemilk yieldmathematical models selectionnon-linear modelsThe objective of this study was to evaluate four mathematical models with regards to their fit to lactation curves of Holstein cows from herds raised in the southwestern region of the state of Parana, Brazil. Initially, 42,281 milk production records from 2005 to 2011 were obtained from "Associação Paranaense de Criadores de Bovinos da Raça Holandesa (APCBRH)". Data lacking dates of drying and total milk production at 305 days of lactation were excluded, resulting in a remaining 15,142 records corresponding to 2,441 Holstein cows. Data were sorted according to the parity order (ranging from one to six), and within each parity order the animals were divided into quartiles (Q25%, Q50%, Q75% and Q100%) corresponding to 305-day lactation yield. Within each parity order, for each quartile, four mathematical models were adjusted, two of which were predominantly empirical (Brody and Wood) whereas the other two presented more mechanistic characteristics (models Dijkstra and Pollott). The quality of fit was evaluated by the corrected Akaike information criterion. The Wood model showed the best fit in almost all evaluated situations and, therefore, may be considered as the most suitable model to describe, at least empirically, the lactation curves of Holstein cows raised in Southwestern Parana.Academia Brasileira de Ciências2015-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100503Anais da Academia Brasileira de Ciências v.87 n.1 2015reponame:Anais da Academia Brasileira de Ciências (Online)instname:Academia Brasileira de Ciências (ABC)instacron:ABC10.1590/0001-3765201520130514info:eu-repo/semantics/openAccessFerreira,Abílio G.T.Henrique,Douglas S.Vieira,Ricardo A.M.Maeda,Emilyn M.Valotto,Altair A.eng2015-11-16T00:00:00Zoai:scielo:S0001-37652015000100503Revistahttp://www.scielo.br/aabchttps://old.scielo.br/oai/scielo-oai.php||aabc@abc.org.br1678-26900001-3765opendoar:2015-11-16T00:00Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)false
dc.title.none.fl_str_mv Fitting mathematical models to lactation curves from holstein cows in the southwestern region of the state of Parana, Brazil
title Fitting mathematical models to lactation curves from holstein cows in the southwestern region of the state of Parana, Brazil
spellingShingle Fitting mathematical models to lactation curves from holstein cows in the southwestern region of the state of Parana, Brazil
Ferreira,Abílio G.T.
dairy cattle
milk yield
mathematical models selection
non-linear models
title_short Fitting mathematical models to lactation curves from holstein cows in the southwestern region of the state of Parana, Brazil
title_full Fitting mathematical models to lactation curves from holstein cows in the southwestern region of the state of Parana, Brazil
title_fullStr Fitting mathematical models to lactation curves from holstein cows in the southwestern region of the state of Parana, Brazil
title_full_unstemmed Fitting mathematical models to lactation curves from holstein cows in the southwestern region of the state of Parana, Brazil
title_sort Fitting mathematical models to lactation curves from holstein cows in the southwestern region of the state of Parana, Brazil
author Ferreira,Abílio G.T.
author_facet Ferreira,Abílio G.T.
Henrique,Douglas S.
Vieira,Ricardo A.M.
Maeda,Emilyn M.
Valotto,Altair A.
author_role author
author2 Henrique,Douglas S.
Vieira,Ricardo A.M.
Maeda,Emilyn M.
Valotto,Altair A.
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Ferreira,Abílio G.T.
Henrique,Douglas S.
Vieira,Ricardo A.M.
Maeda,Emilyn M.
Valotto,Altair A.
dc.subject.por.fl_str_mv dairy cattle
milk yield
mathematical models selection
non-linear models
topic dairy cattle
milk yield
mathematical models selection
non-linear models
description The objective of this study was to evaluate four mathematical models with regards to their fit to lactation curves of Holstein cows from herds raised in the southwestern region of the state of Parana, Brazil. Initially, 42,281 milk production records from 2005 to 2011 were obtained from "Associação Paranaense de Criadores de Bovinos da Raça Holandesa (APCBRH)". Data lacking dates of drying and total milk production at 305 days of lactation were excluded, resulting in a remaining 15,142 records corresponding to 2,441 Holstein cows. Data were sorted according to the parity order (ranging from one to six), and within each parity order the animals were divided into quartiles (Q25%, Q50%, Q75% and Q100%) corresponding to 305-day lactation yield. Within each parity order, for each quartile, four mathematical models were adjusted, two of which were predominantly empirical (Brody and Wood) whereas the other two presented more mechanistic characteristics (models Dijkstra and Pollott). The quality of fit was evaluated by the corrected Akaike information criterion. The Wood model showed the best fit in almost all evaluated situations and, therefore, may be considered as the most suitable model to describe, at least empirically, the lactation curves of Holstein cows raised in Southwestern Parana.
publishDate 2015
dc.date.none.fl_str_mv 2015-03-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100503
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100503
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/0001-3765201520130514
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Academia Brasileira de Ciências
publisher.none.fl_str_mv Academia Brasileira de Ciências
dc.source.none.fl_str_mv Anais da Academia Brasileira de Ciências v.87 n.1 2015
reponame:Anais da Academia Brasileira de Ciências (Online)
instname:Academia Brasileira de Ciências (ABC)
instacron:ABC
instname_str Academia Brasileira de Ciências (ABC)
instacron_str ABC
institution ABC
reponame_str Anais da Academia Brasileira de Ciências (Online)
collection Anais da Academia Brasileira de Ciências (Online)
repository.name.fl_str_mv Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)
repository.mail.fl_str_mv ||aabc@abc.org.br
_version_ 1754302860748652544