Estrus expression and pregnancy rates in heifers primiparous and multiparous Nelore cows subjected to timed artificial insemination with strategic use of gonadotropin-releasing hormone
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.5433/1679-0359.2021v42n6Supl2p3825 http://hdl.handle.net/11449/222664 |
Resumo: | We evaluated the effects of nulliparous, primiparous, and multiparous conditions on the estrus and pregnancy rates in females that did not show estrus but were treated with gonadotropin-releasing hormone (GnRH) at the time of timed artificial insemination (TAI). Nelore females (n = 531) were allocated according to the following categories: nulliparous (n = 144), primiparous (n = 132), and multiparous (n = 255). The animals received a conventional TAI protocol, and estrus expression was identified by the absence of paint in the sacrococcygeal region on the day of TAI. Females that did not show estrus were treated with 10 µg of GnRH together with insemination. The rates of estrus and pregnancy were analyzed using a logistic regression model (P < 0.05). The estrus expression was lower (P = 0.006) in the primiparous (61.36%) group than in the nulliparous (76.39%) and multiparous (75.69%) groups. Similar pregnancy rates were observed in females that showed estrus (nulliparous 84.54%, primiparous 86.42%, and multiparous 80.31%; P = 0.39) and in females that did not show estrus and received GnRH (nulliparous 41.18%, primiparous 56.86%, and multiparous 58.06%; P = 0.24). The total pregnancy rates were also similar (P = 0.98) among the categories (nulliparous 74.3%, primiparous 75.0%, and multiparous 74.9%). The primiparous females had a lower rate of estrus, and the pregnancy rates were similar among the categories that received GnRH. |
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Repositório Institucional da UNESP |
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Estrus expression and pregnancy rates in heifers primiparous and multiparous Nelore cows subjected to timed artificial insemination with strategic use of gonadotropin-releasing hormoneExpressão de estro e taxas de prenhez em novilhas, primíparas e multíparas Nelore submetidas à inseminação artificial em tempo fixo com uso estratégico de hormônio liberador de gonadotrofinaBreeding biotechnologyCategoryCattleConceptionOvulationWe evaluated the effects of nulliparous, primiparous, and multiparous conditions on the estrus and pregnancy rates in females that did not show estrus but were treated with gonadotropin-releasing hormone (GnRH) at the time of timed artificial insemination (TAI). Nelore females (n = 531) were allocated according to the following categories: nulliparous (n = 144), primiparous (n = 132), and multiparous (n = 255). The animals received a conventional TAI protocol, and estrus expression was identified by the absence of paint in the sacrococcygeal region on the day of TAI. Females that did not show estrus were treated with 10 µg of GnRH together with insemination. The rates of estrus and pregnancy were analyzed using a logistic regression model (P < 0.05). The estrus expression was lower (P = 0.006) in the primiparous (61.36%) group than in the nulliparous (76.39%) and multiparous (75.69%) groups. Similar pregnancy rates were observed in females that showed estrus (nulliparous 84.54%, primiparous 86.42%, and multiparous 80.31%; P = 0.39) and in females that did not show estrus and received GnRH (nulliparous 41.18%, primiparous 56.86%, and multiparous 58.06%; P = 0.24). The total pregnancy rates were also similar (P = 0.98) among the categories (nulliparous 74.3%, primiparous 75.0%, and multiparous 74.9%). The primiparous females had a lower rate of estrus, and the pregnancy rates were similar among the categories that received GnRH.Universidade Paranaense UNIPAR, PRNeopecuária Genetics na Bovine Reproduction Company NEOPECUARIA, PRUniversidade Estadual de São Paulo USP, SPLaboratory of Animal Reproduction and Professional Master in Veterinary Clinics Universidade Estadual de Londrina UEL, PRLaboratory of Animal Reproduction and Animal Science Program UEL, PRUniversidade Estadual de São Paulo USP, SPUNIPARNEOPECUARIAUniversidade Estadual Paulista (UNESP)Universidade Estadual de Londrina (UEL)UELBonato, Denis ViniciusFilho, Luigi CarrerSantos, Eriko SilvaFigueira, Murilo RezendeCerezetti, Marcela Bortoletto [UNESP]Morotti, FábioSeneda, Marcelo Marcondes2022-04-28T19:46:00Z2022-04-28T19:46:00Z2021-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article3825-3836http://dx.doi.org/10.5433/1679-0359.2021v42n6Supl2p3825Semina:Ciencias Agrarias, v. 42, n. 6, p. 3825-3836, 2021.1679-03591676-546Xhttp://hdl.handle.net/11449/22266410.5433/1679-0359.2021v42n6Supl2p38252-s2.0-85117244374Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengSemina:Ciencias Agrariasinfo:eu-repo/semantics/openAccess2022-04-28T19:46:01Zoai:repositorio.unesp.br:11449/222664Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T13:59:48.059846Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Estrus expression and pregnancy rates in heifers primiparous and multiparous Nelore cows subjected to timed artificial insemination with strategic use of gonadotropin-releasing hormone Expressão de estro e taxas de prenhez em novilhas, primíparas e multíparas Nelore submetidas à inseminação artificial em tempo fixo com uso estratégico de hormônio liberador de gonadotrofina |
title |
Estrus expression and pregnancy rates in heifers primiparous and multiparous Nelore cows subjected to timed artificial insemination with strategic use of gonadotropin-releasing hormone |
spellingShingle |
Estrus expression and pregnancy rates in heifers primiparous and multiparous Nelore cows subjected to timed artificial insemination with strategic use of gonadotropin-releasing hormone Bonato, Denis Vinicius Breeding biotechnology Category Cattle Conception Ovulation |
title_short |
Estrus expression and pregnancy rates in heifers primiparous and multiparous Nelore cows subjected to timed artificial insemination with strategic use of gonadotropin-releasing hormone |
title_full |
Estrus expression and pregnancy rates in heifers primiparous and multiparous Nelore cows subjected to timed artificial insemination with strategic use of gonadotropin-releasing hormone |
title_fullStr |
Estrus expression and pregnancy rates in heifers primiparous and multiparous Nelore cows subjected to timed artificial insemination with strategic use of gonadotropin-releasing hormone |
title_full_unstemmed |
Estrus expression and pregnancy rates in heifers primiparous and multiparous Nelore cows subjected to timed artificial insemination with strategic use of gonadotropin-releasing hormone |
title_sort |
Estrus expression and pregnancy rates in heifers primiparous and multiparous Nelore cows subjected to timed artificial insemination with strategic use of gonadotropin-releasing hormone |
author |
Bonato, Denis Vinicius |
author_facet |
Bonato, Denis Vinicius Filho, Luigi Carrer Santos, Eriko Silva Figueira, Murilo Rezende Cerezetti, Marcela Bortoletto [UNESP] Morotti, Fábio Seneda, Marcelo Marcondes |
author_role |
author |
author2 |
Filho, Luigi Carrer Santos, Eriko Silva Figueira, Murilo Rezende Cerezetti, Marcela Bortoletto [UNESP] Morotti, Fábio Seneda, Marcelo Marcondes |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
UNIPAR NEOPECUARIA Universidade Estadual Paulista (UNESP) Universidade Estadual de Londrina (UEL) UEL |
dc.contributor.author.fl_str_mv |
Bonato, Denis Vinicius Filho, Luigi Carrer Santos, Eriko Silva Figueira, Murilo Rezende Cerezetti, Marcela Bortoletto [UNESP] Morotti, Fábio Seneda, Marcelo Marcondes |
dc.subject.por.fl_str_mv |
Breeding biotechnology Category Cattle Conception Ovulation |
topic |
Breeding biotechnology Category Cattle Conception Ovulation |
description |
We evaluated the effects of nulliparous, primiparous, and multiparous conditions on the estrus and pregnancy rates in females that did not show estrus but were treated with gonadotropin-releasing hormone (GnRH) at the time of timed artificial insemination (TAI). Nelore females (n = 531) were allocated according to the following categories: nulliparous (n = 144), primiparous (n = 132), and multiparous (n = 255). The animals received a conventional TAI protocol, and estrus expression was identified by the absence of paint in the sacrococcygeal region on the day of TAI. Females that did not show estrus were treated with 10 µg of GnRH together with insemination. The rates of estrus and pregnancy were analyzed using a logistic regression model (P < 0.05). The estrus expression was lower (P = 0.006) in the primiparous (61.36%) group than in the nulliparous (76.39%) and multiparous (75.69%) groups. Similar pregnancy rates were observed in females that showed estrus (nulliparous 84.54%, primiparous 86.42%, and multiparous 80.31%; P = 0.39) and in females that did not show estrus and received GnRH (nulliparous 41.18%, primiparous 56.86%, and multiparous 58.06%; P = 0.24). The total pregnancy rates were also similar (P = 0.98) among the categories (nulliparous 74.3%, primiparous 75.0%, and multiparous 74.9%). The primiparous females had a lower rate of estrus, and the pregnancy rates were similar among the categories that received GnRH. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-01-01 2022-04-28T19:46:00Z 2022-04-28T19:46:00Z |
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/10.5433/1679-0359.2021v42n6Supl2p3825 Semina:Ciencias Agrarias, v. 42, n. 6, p. 3825-3836, 2021. 1679-0359 1676-546X http://hdl.handle.net/11449/222664 10.5433/1679-0359.2021v42n6Supl2p3825 2-s2.0-85117244374 |
url |
http://dx.doi.org/10.5433/1679-0359.2021v42n6Supl2p3825 http://hdl.handle.net/11449/222664 |
identifier_str_mv |
Semina:Ciencias Agrarias, v. 42, n. 6, p. 3825-3836, 2021. 1679-0359 1676-546X 10.5433/1679-0359.2021v42n6Supl2p3825 2-s2.0-85117244374 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Semina:Ciencias Agrarias |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
3825-3836 |
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_ |
1808128302601207808 |