How FTAI and FTET impact reproductive efficiency of Brazilian dairy herds
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://www.ufrgs.br/actavet/39-suple-1/02%20Supl_s3-s13.pdf http://hdl.handle.net/11449/73021 |
Resumo: | Background: Throughout dairy cows evolution, milk production was always the key point to select the superior animal. Currently, several evidences has shown that high milk production have intensively contributed to the decline of dairy cattle fertility. Beyond milk production, dairy cows have their reproductive performance impaired by another factors, heat stress and repeat-breeding. Methods like fixed time artificial insemination and embryo transfer were developed to minimize the effects of these factors, and improve dairy herds profitability. This review aims to show some key-point experiments conducted to improve the efficiency of the self-appointed protocols for artificial insemination and embryo transfer in Brazil, overcoming several reproductive problems. Our goal is to develop cheap and easy self-appointed programs that facilitate animal handling and maximize their reproductive outcomes all over the year. Review: Failure in estrus detection is the mainly limiting factor for the use of artificial insemination in high-production dairy herd. An excellent alternative to overcome the need of estrus detection is fixed time artificial insemination. Many protocols with and without the use of estradiol have been developed to that end. Among the protocols for fixed time artificial insemination without estradiol, DoubleOvsynch has been extensively used recently in American dairy herds. In Brazil, similar pregnancy rate was obtained compared to progesterone-estradiol based protocols for fixed time artificial insemination. Particularities of progesterone-estradiol based protocols as (1) new progesterone device or devices previously used for eight days; (2) different doses of eCG; and (3) the use of estradiol cypionate for fixed time artificial insemination have been studied in Brazil. The use of self-appointed artificial insemination also enabled the reduction of the interval calving-conception compared to cows inseminated following the standing estrus. Regarding the low fertility of repeat breeders and the effect of heat stress at early pregnancy, other methods like embryo transfer became important tools to enhance reproductive efficiency of Brazilian dairy herds. Protocols were also developed to allow fixed time embryo transfer, eliminating the need of estrus detection and improving the reproductive efficiency of lactating recipients. As well as described for fixed time artificial insemination treatments, there is a large variety of hormone combination for fixed time embryo transfer (with and without estradiol). An experiment conducted in Brazil demonstrated that protocols for fixed time embryo transfer without estradiol can be as good as with estradiol to synchronize high-producing Holstein recipients, essentially during summer. Particularities related to embryos cryopreservation, synchronization of the estrus cycle of donors and recipients and the site of embryo release into the uterine horn were also investigated. Greater conception rates were achieved when fresh embryos were transferred compared to frozen-thawed ones. Also, the tight synchronization between donor and recipient (same day of estrus) resulted more pregnancies than when recipients were one day later or in advantage in relation to donors. Moreover, the site of embryo release into the uterine horn (ipsilateral to the corpus luteum) had no effect on pregnancy rates after in vivo produced embryo transfer. Conclusion: Both fixed time artificial insemination and fixed time embryo transfer are important tools to improve reproductive efficiency of high-producing dairy cows. These biotechnologies help bypassing some of the greatest challenges of dairy cattle reproduction: the difficulties of estrus detection, and the low fertility associated to heat stress and repeat breeding. |
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How FTAI and FTET impact reproductive efficiency of Brazilian dairy herdsFTAIFTETHeat stressRepeat breedersReproductive efficiencyAnimaliaBosBackground: Throughout dairy cows evolution, milk production was always the key point to select the superior animal. Currently, several evidences has shown that high milk production have intensively contributed to the decline of dairy cattle fertility. Beyond milk production, dairy cows have their reproductive performance impaired by another factors, heat stress and repeat-breeding. Methods like fixed time artificial insemination and embryo transfer were developed to minimize the effects of these factors, and improve dairy herds profitability. This review aims to show some key-point experiments conducted to improve the efficiency of the self-appointed protocols for artificial insemination and embryo transfer in Brazil, overcoming several reproductive problems. Our goal is to develop cheap and easy self-appointed programs that facilitate animal handling and maximize their reproductive outcomes all over the year. Review: Failure in estrus detection is the mainly limiting factor for the use of artificial insemination in high-production dairy herd. An excellent alternative to overcome the need of estrus detection is fixed time artificial insemination. Many protocols with and without the use of estradiol have been developed to that end. Among the protocols for fixed time artificial insemination without estradiol, DoubleOvsynch has been extensively used recently in American dairy herds. In Brazil, similar pregnancy rate was obtained compared to progesterone-estradiol based protocols for fixed time artificial insemination. Particularities of progesterone-estradiol based protocols as (1) new progesterone device or devices previously used for eight days; (2) different doses of eCG; and (3) the use of estradiol cypionate for fixed time artificial insemination have been studied in Brazil. The use of self-appointed artificial insemination also enabled the reduction of the interval calving-conception compared to cows inseminated following the standing estrus. Regarding the low fertility of repeat breeders and the effect of heat stress at early pregnancy, other methods like embryo transfer became important tools to enhance reproductive efficiency of Brazilian dairy herds. Protocols were also developed to allow fixed time embryo transfer, eliminating the need of estrus detection and improving the reproductive efficiency of lactating recipients. As well as described for fixed time artificial insemination treatments, there is a large variety of hormone combination for fixed time embryo transfer (with and without estradiol). An experiment conducted in Brazil demonstrated that protocols for fixed time embryo transfer without estradiol can be as good as with estradiol to synchronize high-producing Holstein recipients, essentially during summer. Particularities related to embryos cryopreservation, synchronization of the estrus cycle of donors and recipients and the site of embryo release into the uterine horn were also investigated. Greater conception rates were achieved when fresh embryos were transferred compared to frozen-thawed ones. Also, the tight synchronization between donor and recipient (same day of estrus) resulted more pregnancies than when recipients were one day later or in advantage in relation to donors. Moreover, the site of embryo release into the uterine horn (ipsilateral to the corpus luteum) had no effect on pregnancy rates after in vivo produced embryo transfer. Conclusion: Both fixed time artificial insemination and fixed time embryo transfer are important tools to improve reproductive efficiency of high-producing dairy cows. These biotechnologies help bypassing some of the greatest challenges of dairy cattle reproduction: the difficulties of estrus detection, and the low fertility associated to heat stress and repeat breeding.Clínica SAMVET de São Carlos, São Carlos, SPDepartamento de Reprodução Animal Faculdade de Medicina Veterinária e Zootecnia (FMVZ) Universidade de São Paulo (USP), São Paulo, SPDepartamento de Reprodução Animal e Medicina Veterinária Preventiva Faculdade de Ciências Agrárias e Veterinária (FCAV) Universidade Estadual Paulista (UNESP), Jaboticabal, SPDepartamento de Reprodução Animal e Medicina Veterinária Preventiva Faculdade de Ciências Agrárias e Veterinária (FCAV) Universidade Estadual Paulista (UNESP), Jaboticabal, SPClínica SAMVET de São CarlosUniversidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Rodrigues, Carlos AlbertoFerreira, Roberta MachadoVieira, Lais MendesRanieri, Andressa L. [UNESP]Silva, Péricles R.L.Baruselli, Pietro Sampaio2014-05-27T11:26:18Z2014-05-27T11:26:18Z2011-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://www.ufrgs.br/actavet/39-suple-1/02%20Supl_s3-s13.pdfActa Scientiae Veterinariae, v. 39, n. SUPPL. 1, 2011.1678-03451679-9216http://hdl.handle.net/11449/730212-s2.0-848686113322-s2.0-84868611332.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengActa Scientiae Veterinariae0.2170,1440,144info:eu-repo/semantics/openAccess2024-06-06T18:09:34Zoai:repositorio.unesp.br:11449/73021Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:06:19.302323Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
How FTAI and FTET impact reproductive efficiency of Brazilian dairy herds |
title |
How FTAI and FTET impact reproductive efficiency of Brazilian dairy herds |
spellingShingle |
How FTAI and FTET impact reproductive efficiency of Brazilian dairy herds Rodrigues, Carlos Alberto FTAI FTET Heat stress Repeat breeders Reproductive efficiency Animalia Bos |
title_short |
How FTAI and FTET impact reproductive efficiency of Brazilian dairy herds |
title_full |
How FTAI and FTET impact reproductive efficiency of Brazilian dairy herds |
title_fullStr |
How FTAI and FTET impact reproductive efficiency of Brazilian dairy herds |
title_full_unstemmed |
How FTAI and FTET impact reproductive efficiency of Brazilian dairy herds |
title_sort |
How FTAI and FTET impact reproductive efficiency of Brazilian dairy herds |
author |
Rodrigues, Carlos Alberto |
author_facet |
Rodrigues, Carlos Alberto Ferreira, Roberta Machado Vieira, Lais Mendes Ranieri, Andressa L. [UNESP] Silva, Péricles R.L. Baruselli, Pietro Sampaio |
author_role |
author |
author2 |
Ferreira, Roberta Machado Vieira, Lais Mendes Ranieri, Andressa L. [UNESP] Silva, Péricles R.L. Baruselli, Pietro Sampaio |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Clínica SAMVET de São Carlos Universidade de São Paulo (USP) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Rodrigues, Carlos Alberto Ferreira, Roberta Machado Vieira, Lais Mendes Ranieri, Andressa L. [UNESP] Silva, Péricles R.L. Baruselli, Pietro Sampaio |
dc.subject.por.fl_str_mv |
FTAI FTET Heat stress Repeat breeders Reproductive efficiency Animalia Bos |
topic |
FTAI FTET Heat stress Repeat breeders Reproductive efficiency Animalia Bos |
description |
Background: Throughout dairy cows evolution, milk production was always the key point to select the superior animal. Currently, several evidences has shown that high milk production have intensively contributed to the decline of dairy cattle fertility. Beyond milk production, dairy cows have their reproductive performance impaired by another factors, heat stress and repeat-breeding. Methods like fixed time artificial insemination and embryo transfer were developed to minimize the effects of these factors, and improve dairy herds profitability. This review aims to show some key-point experiments conducted to improve the efficiency of the self-appointed protocols for artificial insemination and embryo transfer in Brazil, overcoming several reproductive problems. Our goal is to develop cheap and easy self-appointed programs that facilitate animal handling and maximize their reproductive outcomes all over the year. Review: Failure in estrus detection is the mainly limiting factor for the use of artificial insemination in high-production dairy herd. An excellent alternative to overcome the need of estrus detection is fixed time artificial insemination. Many protocols with and without the use of estradiol have been developed to that end. Among the protocols for fixed time artificial insemination without estradiol, DoubleOvsynch has been extensively used recently in American dairy herds. In Brazil, similar pregnancy rate was obtained compared to progesterone-estradiol based protocols for fixed time artificial insemination. Particularities of progesterone-estradiol based protocols as (1) new progesterone device or devices previously used for eight days; (2) different doses of eCG; and (3) the use of estradiol cypionate for fixed time artificial insemination have been studied in Brazil. The use of self-appointed artificial insemination also enabled the reduction of the interval calving-conception compared to cows inseminated following the standing estrus. Regarding the low fertility of repeat breeders and the effect of heat stress at early pregnancy, other methods like embryo transfer became important tools to enhance reproductive efficiency of Brazilian dairy herds. Protocols were also developed to allow fixed time embryo transfer, eliminating the need of estrus detection and improving the reproductive efficiency of lactating recipients. As well as described for fixed time artificial insemination treatments, there is a large variety of hormone combination for fixed time embryo transfer (with and without estradiol). An experiment conducted in Brazil demonstrated that protocols for fixed time embryo transfer without estradiol can be as good as with estradiol to synchronize high-producing Holstein recipients, essentially during summer. Particularities related to embryos cryopreservation, synchronization of the estrus cycle of donors and recipients and the site of embryo release into the uterine horn were also investigated. Greater conception rates were achieved when fresh embryos were transferred compared to frozen-thawed ones. Also, the tight synchronization between donor and recipient (same day of estrus) resulted more pregnancies than when recipients were one day later or in advantage in relation to donors. Moreover, the site of embryo release into the uterine horn (ipsilateral to the corpus luteum) had no effect on pregnancy rates after in vivo produced embryo transfer. Conclusion: Both fixed time artificial insemination and fixed time embryo transfer are important tools to improve reproductive efficiency of high-producing dairy cows. These biotechnologies help bypassing some of the greatest challenges of dairy cattle reproduction: the difficulties of estrus detection, and the low fertility associated to heat stress and repeat breeding. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-12-01 2014-05-27T11:26:18Z 2014-05-27T11:26:18Z |
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://www.ufrgs.br/actavet/39-suple-1/02%20Supl_s3-s13.pdf Acta Scientiae Veterinariae, v. 39, n. SUPPL. 1, 2011. 1678-0345 1679-9216 http://hdl.handle.net/11449/73021 2-s2.0-84868611332 2-s2.0-84868611332.pdf |
url |
http://www.ufrgs.br/actavet/39-suple-1/02%20Supl_s3-s13.pdf http://hdl.handle.net/11449/73021 |
identifier_str_mv |
Acta Scientiae Veterinariae, v. 39, n. SUPPL. 1, 2011. 1678-0345 1679-9216 2-s2.0-84868611332 2-s2.0-84868611332.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
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Acta Scientiae Veterinariae 0.217 0,144 0,144 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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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 |
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Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
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1808128894976393216 |