Annual characteristics of estrous activity in wool and hair ewe lambs under subtropical conditions
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Scientia Agrícola (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500003 |
Resumo: | The increased emphasis placed on lamb production in Brazil points to the need for a better knowledge of the annual pattern of reproductive activity in ewe lambs. This study evaluates the annual estrous activity pattern of hair and wool ewe lambs raised in southeast Brazil. Estrous characteristics were recorded for 12 months in ten Santa Inês and 21 Romney Marsh and Suffolk ewe lambs. Santa Inês ewe lambs exhibited a greater length of the normal estrous cycle (14 to 19 days) than Romney Marsh and Suffolk ewe lambs (17.0 ± 0.1 days vs. 16.5 ± 0.2 and 15.9 ± 0.2 days). All the ewe lambs presented a greater number of periods of estrus per animal per month for single estrous cycles (up to 26 days) during autumn and winter. During spring and summer there was a reduction of this number but this decline varied according to the breed. For Santa Inês ewe lambs the reduction was only significant in the summer. For wool ewe lambs the reduction was significant in both seasons but was more accentuated for Romney Marsh. The Romney Marsh ewe lambs had a more restricted breeding season than Suffolk and both presented optimal estrus activity in autumn and winter. Santa Inês ewe lambs had a continuous distribution of estrous cycles along the year, although presenting a reduction in the number of estrous periods in the summer. The ewe lambs of three breeds presented characteristics of sexual immaturity, like irregular estrous cycles and silent ovulations. |
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Annual characteristics of estrous activity in wool and hair ewe lambs under subtropical conditionsbreedsestrous cyclesheepsubtropicsseasonalityThe increased emphasis placed on lamb production in Brazil points to the need for a better knowledge of the annual pattern of reproductive activity in ewe lambs. This study evaluates the annual estrous activity pattern of hair and wool ewe lambs raised in southeast Brazil. Estrous characteristics were recorded for 12 months in ten Santa Inês and 21 Romney Marsh and Suffolk ewe lambs. Santa Inês ewe lambs exhibited a greater length of the normal estrous cycle (14 to 19 days) than Romney Marsh and Suffolk ewe lambs (17.0 ± 0.1 days vs. 16.5 ± 0.2 and 15.9 ± 0.2 days). All the ewe lambs presented a greater number of periods of estrus per animal per month for single estrous cycles (up to 26 days) during autumn and winter. During spring and summer there was a reduction of this number but this decline varied according to the breed. For Santa Inês ewe lambs the reduction was only significant in the summer. For wool ewe lambs the reduction was significant in both seasons but was more accentuated for Romney Marsh. The Romney Marsh ewe lambs had a more restricted breeding season than Suffolk and both presented optimal estrus activity in autumn and winter. Santa Inês ewe lambs had a continuous distribution of estrous cycles along the year, although presenting a reduction in the number of estrous periods in the summer. The ewe lambs of three breeds presented characteristics of sexual immaturity, like irregular estrous cycles and silent ovulations.Escola Superior de Agricultura "Luiz de Queiroz"2007-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500003Scientia Agricola v.64 n.5 2007reponame:Scientia Agrícola (Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/S0103-90162007000500003info:eu-repo/semantics/openAccessRodrigues,Paula de AlmeidaCoelho,Lia de AlencarNonaka,Keico OkinoSasa,AyaVicente,Wilter Ricardo RussianoBalieiro,Júlio César de CarvalhoSiqueira,Edson Ramos deeng2007-10-05T00:00:00Zoai:scielo:S0103-90162007000500003Revistahttp://revistas.usp.br/sa/indexPUBhttps://old.scielo.br/oai/scielo-oai.phpscientia@usp.br||alleoni@usp.br1678-992X0103-9016opendoar:2007-10-05T00:00Scientia Agrícola (Online) - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Annual characteristics of estrous activity in wool and hair ewe lambs under subtropical conditions |
title |
Annual characteristics of estrous activity in wool and hair ewe lambs under subtropical conditions |
spellingShingle |
Annual characteristics of estrous activity in wool and hair ewe lambs under subtropical conditions Rodrigues,Paula de Almeida breeds estrous cycle sheep subtropics seasonality |
title_short |
Annual characteristics of estrous activity in wool and hair ewe lambs under subtropical conditions |
title_full |
Annual characteristics of estrous activity in wool and hair ewe lambs under subtropical conditions |
title_fullStr |
Annual characteristics of estrous activity in wool and hair ewe lambs under subtropical conditions |
title_full_unstemmed |
Annual characteristics of estrous activity in wool and hair ewe lambs under subtropical conditions |
title_sort |
Annual characteristics of estrous activity in wool and hair ewe lambs under subtropical conditions |
author |
Rodrigues,Paula de Almeida |
author_facet |
Rodrigues,Paula de Almeida Coelho,Lia de Alencar Nonaka,Keico Okino Sasa,Aya Vicente,Wilter Ricardo Russiano Balieiro,Júlio César de Carvalho Siqueira,Edson Ramos de |
author_role |
author |
author2 |
Coelho,Lia de Alencar Nonaka,Keico Okino Sasa,Aya Vicente,Wilter Ricardo Russiano Balieiro,Júlio César de Carvalho Siqueira,Edson Ramos de |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Rodrigues,Paula de Almeida Coelho,Lia de Alencar Nonaka,Keico Okino Sasa,Aya Vicente,Wilter Ricardo Russiano Balieiro,Júlio César de Carvalho Siqueira,Edson Ramos de |
dc.subject.por.fl_str_mv |
breeds estrous cycle sheep subtropics seasonality |
topic |
breeds estrous cycle sheep subtropics seasonality |
description |
The increased emphasis placed on lamb production in Brazil points to the need for a better knowledge of the annual pattern of reproductive activity in ewe lambs. This study evaluates the annual estrous activity pattern of hair and wool ewe lambs raised in southeast Brazil. Estrous characteristics were recorded for 12 months in ten Santa Inês and 21 Romney Marsh and Suffolk ewe lambs. Santa Inês ewe lambs exhibited a greater length of the normal estrous cycle (14 to 19 days) than Romney Marsh and Suffolk ewe lambs (17.0 ± 0.1 days vs. 16.5 ± 0.2 and 15.9 ± 0.2 days). All the ewe lambs presented a greater number of periods of estrus per animal per month for single estrous cycles (up to 26 days) during autumn and winter. During spring and summer there was a reduction of this number but this decline varied according to the breed. For Santa Inês ewe lambs the reduction was only significant in the summer. For wool ewe lambs the reduction was significant in both seasons but was more accentuated for Romney Marsh. The Romney Marsh ewe lambs had a more restricted breeding season than Suffolk and both presented optimal estrus activity in autumn and winter. Santa Inês ewe lambs had a continuous distribution of estrous cycles along the year, although presenting a reduction in the number of estrous periods in the summer. The ewe lambs of three breeds presented characteristics of sexual immaturity, like irregular estrous cycles and silent ovulations. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007-10-01 |
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=S0103-90162007000500003 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500003 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-90162007000500003 |
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 |
Escola Superior de Agricultura "Luiz de Queiroz" |
publisher.none.fl_str_mv |
Escola Superior de Agricultura "Luiz de Queiroz" |
dc.source.none.fl_str_mv |
Scientia Agricola v.64 n.5 2007 reponame:Scientia Agrícola (Online) instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Scientia Agrícola (Online) |
collection |
Scientia Agrícola (Online) |
repository.name.fl_str_mv |
Scientia Agrícola (Online) - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
scientia@usp.br||alleoni@usp.br |
_version_ |
1748936460588810240 |