Asynchronous breeding in red brocket deer (Mazama americana): seasonal changes in male reproductive characteristics, seminal parameters, androgen levels, and antler cycle
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
DOI: | 10.1007/s42991-020-00020-2 |
Texto Completo: | http://dx.doi.org/10.1007/s42991-020-00020-2 http://hdl.handle.net/11449/200420 |
Resumo: | The red brocket deer is the largest species in the genus Mazama and one of the most abundant and widely distributed cervid in the Neotropics. Yet it has been classified as data deficient by the IUCN, and the limited knowledge on its reproductive biology indicates that red brocket bucks do not possess an annual antler cycle and are capable of breeding during antler casting and growth. Here, in parallel to antler cycle, we investigated seasonal changes in morphometric (body weight, neck and chest girth, and testicular volume), endocrine [plasma testosterone and fecal androgen metabolites (FAM) levels] and seminal (total sperm count and sperm motility index) parameters from captive adult red brocket bucks collected on a quarterly basis over a 1-year period. Two out of six males kept hard antlers year-round, three cast antlers from winter to spring, and one carried velvet antlers for longer than 6 months. No clear seasonal patterns of variation in gross morphometry, seminal traits, and hormonal levels were found, and mean values of all collected parameters did not show differences among seasons. Body weight was positively correlated with most morphometric measurements and seminal parameters, while chest girth was positively correlated with neck girth, testicular volume, and total sperm count. Neither androgen levels (both plasma testosterone and FAM) nor hard antler phase correlated with seminal characteristics. Our findings support that red brocket bucks not only exhibit aseasonal and asynchronous antler cycles, but also maintain their secondary sexual characteristics and semen quality unchanged over the year. This apparent lack of photoperiodic stimuli for controlling reproduction along with an absence of relationship between seminal parameters and antler status might make red brockets unique in terms of reproductive biology among deer species. |
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Asynchronous breeding in red brocket deer (Mazama americana): seasonal changes in male reproductive characteristics, seminal parameters, androgen levels, and antler cycleAseasonalCervidaeDeerMale reproductionNeotropicsReproductive biologyThe red brocket deer is the largest species in the genus Mazama and one of the most abundant and widely distributed cervid in the Neotropics. Yet it has been classified as data deficient by the IUCN, and the limited knowledge on its reproductive biology indicates that red brocket bucks do not possess an annual antler cycle and are capable of breeding during antler casting and growth. Here, in parallel to antler cycle, we investigated seasonal changes in morphometric (body weight, neck and chest girth, and testicular volume), endocrine [plasma testosterone and fecal androgen metabolites (FAM) levels] and seminal (total sperm count and sperm motility index) parameters from captive adult red brocket bucks collected on a quarterly basis over a 1-year period. Two out of six males kept hard antlers year-round, three cast antlers from winter to spring, and one carried velvet antlers for longer than 6 months. No clear seasonal patterns of variation in gross morphometry, seminal traits, and hormonal levels were found, and mean values of all collected parameters did not show differences among seasons. Body weight was positively correlated with most morphometric measurements and seminal parameters, while chest girth was positively correlated with neck girth, testicular volume, and total sperm count. Neither androgen levels (both plasma testosterone and FAM) nor hard antler phase correlated with seminal characteristics. Our findings support that red brocket bucks not only exhibit aseasonal and asynchronous antler cycles, but also maintain their secondary sexual characteristics and semen quality unchanged over the year. This apparent lack of photoperiodic stimuli for controlling reproduction along with an absence of relationship between seminal parameters and antler status might make red brockets unique in terms of reproductive biology among deer species.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Grupo de Estudos para Multiplicação de Aves (GEMA) Departamento de Reprodução Animal Faculdade de Medicina Veterinária e Zootecnia Universidade de São PauloPrograma de Pós Graduação em Medicina Veterinária Faculdade de Ciências Agrárias e Veterinárias Universidade Estadual Paulista (UNESP), Via de Acesso Professor Paulo Donato Castellane s/nNúcleo de Pesquisa e Conservação de Cervídeos (NUPECCE) Departamento de Zootecnia Faculdade de Ciências Agrárias e Veterinárias Universidade Estadual Paulista (UNESP), Via de Acesso Professor Paulo Donato Castellane s/nPrograma de Pós Graduação em Medicina Veterinária Faculdade de Ciências Agrárias e Veterinárias Universidade Estadual Paulista (UNESP), Via de Acesso Professor Paulo Donato Castellane s/nNúcleo de Pesquisa e Conservação de Cervídeos (NUPECCE) Departamento de Zootecnia Faculdade de Ciências Agrárias e Veterinárias Universidade Estadual Paulista (UNESP), Via de Acesso Professor Paulo Donato Castellane s/nFAPESP: 2007/08173-0Universidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Pereira, Ricardo José GarciaCrivelaro, Roberta Martins [UNESP]Tanaka, Yuki [UNESP]Blank, Marcel HenriqueDuarte, José Maurício Barbanti [UNESP]2020-12-12T02:06:10Z2020-12-12T02:06:10Z2020-06-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article253-259http://dx.doi.org/10.1007/s42991-020-00020-2Mammalian Biology, v. 100, n. 3, p. 253-259, 2020.1618-14761616-5047http://hdl.handle.net/11449/20042010.1007/s42991-020-00020-22-s2.0-85084767097Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMammalian Biologyinfo:eu-repo/semantics/openAccess2024-06-07T18:44:44Zoai:repositorio.unesp.br:11449/200420Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:21:49.994144Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Asynchronous breeding in red brocket deer (Mazama americana): seasonal changes in male reproductive characteristics, seminal parameters, androgen levels, and antler cycle |
title |
Asynchronous breeding in red brocket deer (Mazama americana): seasonal changes in male reproductive characteristics, seminal parameters, androgen levels, and antler cycle |
spellingShingle |
Asynchronous breeding in red brocket deer (Mazama americana): seasonal changes in male reproductive characteristics, seminal parameters, androgen levels, and antler cycle Asynchronous breeding in red brocket deer (Mazama americana): seasonal changes in male reproductive characteristics, seminal parameters, androgen levels, and antler cycle Pereira, Ricardo José Garcia Aseasonal Cervidae Deer Male reproduction Neotropics Reproductive biology Pereira, Ricardo José Garcia Aseasonal Cervidae Deer Male reproduction Neotropics Reproductive biology |
title_short |
Asynchronous breeding in red brocket deer (Mazama americana): seasonal changes in male reproductive characteristics, seminal parameters, androgen levels, and antler cycle |
title_full |
Asynchronous breeding in red brocket deer (Mazama americana): seasonal changes in male reproductive characteristics, seminal parameters, androgen levels, and antler cycle |
title_fullStr |
Asynchronous breeding in red brocket deer (Mazama americana): seasonal changes in male reproductive characteristics, seminal parameters, androgen levels, and antler cycle Asynchronous breeding in red brocket deer (Mazama americana): seasonal changes in male reproductive characteristics, seminal parameters, androgen levels, and antler cycle |
title_full_unstemmed |
Asynchronous breeding in red brocket deer (Mazama americana): seasonal changes in male reproductive characteristics, seminal parameters, androgen levels, and antler cycle Asynchronous breeding in red brocket deer (Mazama americana): seasonal changes in male reproductive characteristics, seminal parameters, androgen levels, and antler cycle |
title_sort |
Asynchronous breeding in red brocket deer (Mazama americana): seasonal changes in male reproductive characteristics, seminal parameters, androgen levels, and antler cycle |
author |
Pereira, Ricardo José Garcia |
author_facet |
Pereira, Ricardo José Garcia Pereira, Ricardo José Garcia Crivelaro, Roberta Martins [UNESP] Tanaka, Yuki [UNESP] Blank, Marcel Henrique Duarte, José Maurício Barbanti [UNESP] Crivelaro, Roberta Martins [UNESP] Tanaka, Yuki [UNESP] Blank, Marcel Henrique Duarte, José Maurício Barbanti [UNESP] |
author_role |
author |
author2 |
Crivelaro, Roberta Martins [UNESP] Tanaka, Yuki [UNESP] Blank, Marcel Henrique Duarte, José Maurício Barbanti [UNESP] |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Pereira, Ricardo José Garcia Crivelaro, Roberta Martins [UNESP] Tanaka, Yuki [UNESP] Blank, Marcel Henrique Duarte, José Maurício Barbanti [UNESP] |
dc.subject.por.fl_str_mv |
Aseasonal Cervidae Deer Male reproduction Neotropics Reproductive biology |
topic |
Aseasonal Cervidae Deer Male reproduction Neotropics Reproductive biology |
description |
The red brocket deer is the largest species in the genus Mazama and one of the most abundant and widely distributed cervid in the Neotropics. Yet it has been classified as data deficient by the IUCN, and the limited knowledge on its reproductive biology indicates that red brocket bucks do not possess an annual antler cycle and are capable of breeding during antler casting and growth. Here, in parallel to antler cycle, we investigated seasonal changes in morphometric (body weight, neck and chest girth, and testicular volume), endocrine [plasma testosterone and fecal androgen metabolites (FAM) levels] and seminal (total sperm count and sperm motility index) parameters from captive adult red brocket bucks collected on a quarterly basis over a 1-year period. Two out of six males kept hard antlers year-round, three cast antlers from winter to spring, and one carried velvet antlers for longer than 6 months. No clear seasonal patterns of variation in gross morphometry, seminal traits, and hormonal levels were found, and mean values of all collected parameters did not show differences among seasons. Body weight was positively correlated with most morphometric measurements and seminal parameters, while chest girth was positively correlated with neck girth, testicular volume, and total sperm count. Neither androgen levels (both plasma testosterone and FAM) nor hard antler phase correlated with seminal characteristics. Our findings support that red brocket bucks not only exhibit aseasonal and asynchronous antler cycles, but also maintain their secondary sexual characteristics and semen quality unchanged over the year. This apparent lack of photoperiodic stimuli for controlling reproduction along with an absence of relationship between seminal parameters and antler status might make red brockets unique in terms of reproductive biology among deer species. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-12T02:06:10Z 2020-12-12T02:06:10Z 2020-06-01 |
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 |
http://dx.doi.org/10.1007/s42991-020-00020-2 Mammalian Biology, v. 100, n. 3, p. 253-259, 2020. 1618-1476 1616-5047 http://hdl.handle.net/11449/200420 10.1007/s42991-020-00020-2 2-s2.0-85084767097 |
url |
http://dx.doi.org/10.1007/s42991-020-00020-2 http://hdl.handle.net/11449/200420 |
identifier_str_mv |
Mammalian Biology, v. 100, n. 3, p. 253-259, 2020. 1618-1476 1616-5047 10.1007/s42991-020-00020-2 2-s2.0-85084767097 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Mammalian Biology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
253-259 |
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_ |
1822232245728968704 |
dc.identifier.doi.none.fl_str_mv |
10.1007/s42991-020-00020-2 |