Estudo de Efeitos Ambientais que Influem na Forma da Curva de Lactação de Cabras Mestiças no Estado da Paraíba
Autor(a) principal: | |
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Data de Publicação: | 1999 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://hdl.handle.net/11449/219315 |
Resumo: | The objective of this experiment was to study the effect of environmental factors on the shape of lactation curves (peak yield, time of peak and persistency) of crossbred Alpine x Gurguéia goats fitted by Incomplete gamma function. Data from 6126 records of 877 lactation of 366 goats raised on Carnaúba Farm, Taperoá city, Parafba State in the period from 1988 to 1995 were used. The function was fitted by linear regression, after logarithmic transformation and by non-linear iterative method. Adjusted coefficient of determination (R2a) for linear regression was 71% versus a R2a of 90% obtained by non-linear regression. Peak yield, time of peak and persistency were obtained by fitting the non-linear regression, that showed superior fit. The study of environmental effects on those traits was made by least squares method, including in the model the following factors: calving type, calving order, calving year and calving season. The environmental effects affected all the studied traits. Higher milk peak yields were observed for adult goats, which was justified by the complete physiological development of these animals. |
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Estudo de Efeitos Ambientais que Influem na Forma da Curva de Lactação de Cabras Mestiças no Estado da ParaíbaStudy of the Environmental Effects that Affect the Shape of Lactation Curves of Crossbred Goats in Paraíba StateGoatsIncomplete gamma functionLactation curveThe objective of this experiment was to study the effect of environmental factors on the shape of lactation curves (peak yield, time of peak and persistency) of crossbred Alpine x Gurguéia goats fitted by Incomplete gamma function. Data from 6126 records of 877 lactation of 366 goats raised on Carnaúba Farm, Taperoá city, Parafba State in the period from 1988 to 1995 were used. The function was fitted by linear regression, after logarithmic transformation and by non-linear iterative method. Adjusted coefficient of determination (R2a) for linear regression was 71% versus a R2a of 90% obtained by non-linear regression. Peak yield, time of peak and persistency were obtained by fitting the non-linear regression, that showed superior fit. The study of environmental effects on those traits was made by least squares method, including in the model the following factors: calving type, calving order, calving year and calving season. The environmental effects affected all the studied traits. Higher milk peak yields were observed for adult goats, which was justified by the complete physiological development of these animals.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)FCAV UNESP PICD, JaboticabalDZ CCA/UFPB Campus III, Areia-PBCNPqFCAV UNESP PICD, JaboticabalUniversidade Estadual Paulista (UNESP)Universidade Federal da Paraíba (UFPB)CNPqRibeiro, Maria Norma [UNESP]Pimenta Filho, Edgard Cavalcanti2022-04-28T18:54:58Z2022-04-28T18:54:58Z1999-07-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article868-874Revista Brasileira de Zootecnia, v. 28, n. 4, p. 868-874, 1999.0100-4859http://hdl.handle.net/11449/2193152-s2.0-0347083113Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporRevista Brasileira de Zootecniainfo:eu-repo/semantics/openAccess2022-04-28T18:54:58Zoai:repositorio.unesp.br:11449/219315Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462022-04-28T18:54:58Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Estudo de Efeitos Ambientais que Influem na Forma da Curva de Lactação de Cabras Mestiças no Estado da Paraíba Study of the Environmental Effects that Affect the Shape of Lactation Curves of Crossbred Goats in Paraíba State |
title |
Estudo de Efeitos Ambientais que Influem na Forma da Curva de Lactação de Cabras Mestiças no Estado da Paraíba |
spellingShingle |
Estudo de Efeitos Ambientais que Influem na Forma da Curva de Lactação de Cabras Mestiças no Estado da Paraíba Ribeiro, Maria Norma [UNESP] Goats Incomplete gamma function Lactation curve |
title_short |
Estudo de Efeitos Ambientais que Influem na Forma da Curva de Lactação de Cabras Mestiças no Estado da Paraíba |
title_full |
Estudo de Efeitos Ambientais que Influem na Forma da Curva de Lactação de Cabras Mestiças no Estado da Paraíba |
title_fullStr |
Estudo de Efeitos Ambientais que Influem na Forma da Curva de Lactação de Cabras Mestiças no Estado da Paraíba |
title_full_unstemmed |
Estudo de Efeitos Ambientais que Influem na Forma da Curva de Lactação de Cabras Mestiças no Estado da Paraíba |
title_sort |
Estudo de Efeitos Ambientais que Influem na Forma da Curva de Lactação de Cabras Mestiças no Estado da Paraíba |
author |
Ribeiro, Maria Norma [UNESP] |
author_facet |
Ribeiro, Maria Norma [UNESP] Pimenta Filho, Edgard Cavalcanti |
author_role |
author |
author2 |
Pimenta Filho, Edgard Cavalcanti |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) Universidade Federal da Paraíba (UFPB) CNPq |
dc.contributor.author.fl_str_mv |
Ribeiro, Maria Norma [UNESP] Pimenta Filho, Edgard Cavalcanti |
dc.subject.por.fl_str_mv |
Goats Incomplete gamma function Lactation curve |
topic |
Goats Incomplete gamma function Lactation curve |
description |
The objective of this experiment was to study the effect of environmental factors on the shape of lactation curves (peak yield, time of peak and persistency) of crossbred Alpine x Gurguéia goats fitted by Incomplete gamma function. Data from 6126 records of 877 lactation of 366 goats raised on Carnaúba Farm, Taperoá city, Parafba State in the period from 1988 to 1995 were used. The function was fitted by linear regression, after logarithmic transformation and by non-linear iterative method. Adjusted coefficient of determination (R2a) for linear regression was 71% versus a R2a of 90% obtained by non-linear regression. Peak yield, time of peak and persistency were obtained by fitting the non-linear regression, that showed superior fit. The study of environmental effects on those traits was made by least squares method, including in the model the following factors: calving type, calving order, calving year and calving season. The environmental effects affected all the studied traits. Higher milk peak yields were observed for adult goats, which was justified by the complete physiological development of these animals. |
publishDate |
1999 |
dc.date.none.fl_str_mv |
1999-07-01 2022-04-28T18:54:58Z 2022-04-28T18:54:58Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
Revista Brasileira de Zootecnia, v. 28, n. 4, p. 868-874, 1999. 0100-4859 http://hdl.handle.net/11449/219315 2-s2.0-0347083113 |
identifier_str_mv |
Revista Brasileira de Zootecnia, v. 28, n. 4, p. 868-874, 1999. 0100-4859 2-s2.0-0347083113 |
url |
http://hdl.handle.net/11449/219315 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Revista Brasileira de Zootecnia |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
868-874 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1799964747008835584 |