Postponement of the preovulatory LH surge does not impair the developmental potential of in vivo matured oocytes from eCG/PG-superovulated heifers

Vos, P.L.A.M.; Leemput, E.E. van de; Zeinstra, E.; Bevers, M.M.; Dieleman, S.J.

doi:10.1016/0093-691x(96)84802-3

Cited by 10 publications

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“…This can be explained by a decreased flow of meiosis‐arresting substances from granulosa cells to the oocyte (Revah and Butler 1996). Vos et al. (1996), on the other hand, did not find any adverse effect of a 16 h postponement of the LH surge on the developmental competence of in vivo matured oocytes.…”

Section: Adverse Effects Of a Negative Energy Balance On Oocyte Qualitymentioning

confidence: 67%

Reduced Fertility in High‐yielding Dairy Cows: Are the Oocyte and Embryo in Danger? Part I  The Importance of Negative Energy Balance and Altered Corpus Luteum Function to the Reduction of Oocyte and Embryo Quality in High‐yielding Dairy Cows*

Leroy

Opsomer

Soom

et al. 2008

Reprod Domestic Animals

184

125

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Fertility in high yielding dairy cows is declining, and there is increasing evidence to presume that oocyte and embryo quality are major factors in the complex pathogenesis of reproductive failure. In this report we present an overview of possible mechanisms linking negative energy balance (NEB) and deficiencies in oocyte and embryo developmental competence; specifically, in the high producing dairy cow. Changes in follicular growth patterns during a period of NEB can indirectly affect oocyte quality. The endocrine and biochemical changes, which are associated with NEB, are reflected in the microenvironment of the growing and maturing female gamete, and likely result in the ovulation of a developmentally incompetent oocyte. Even after an oocyte is successfully ovulated and fertilized, a full-term pregnancy is still not guaranteed. Inadequate corpus luteum function, associated with reduced progesterone, and probably also low insulin-like growth factor concentrations, can cause a suboptimal microenvironment in the uterus that is incapable of sustaining early embryonic life. This may partly account for the low conception rates and the high incidence of early embryonic mortality in high yielding dairy cows.

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Section: Adverse Effects Of a Negative Energy Balance On Oocyte Qualitymentioning

confidence: 67%

Reduced Fertility in High‐yielding Dairy Cows: Are the Oocyte and Embryo in Danger? Part I  The Importance of Negative Energy Balance and Altered Corpus Luteum Function to the Reduction of Oocyte and Embryo Quality in High‐yielding Dairy Cows*

Leroy

Opsomer

Soom

et al. 2008

Reprod Domestic Animals

184

125

View full text Add to dashboard Cite

show abstract

“…É possível especular, também, que a exposição a altas concentrações de estradiol -que normalmente aconteceria próximo do cio -poderia interferir no transporte dos gametas e no meio ambiente do oviduto, impossibilitando a fertilização e o desenvolvimento embrionário (GREVE et al, 1995;VOS et al, 1996). …”

Section: Discussionunclassified

Resposta superovulatória na primeira onda de crescimento folicular em doadoras Nelore (Bos indicus)

Nasser¹

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“…Segundo este mesmo autor, em experimentos com folículos persistentes observou-se que os mesmos continham oócitos inferiores devido a uma maturação nuclear prematura. Contrariamente, Vos et al (1996) subsequente podem auxiliar na dificuldade da correta maturação nuclear afetando a formação do fuso e organização microtubular do oócito.…”

Section: Autorunclassified

<b>Perfil lipídico do plasma de vacas leiteiras segundo abordagem \"ômica\" e sua relação com desempenho reprodutivo<b>

Naves¹

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AGRADECIMENTOSÀ Deus por guiar-me nesta e em todas as trajetórias; Aos meus pais (Márcio Antônio Naves e Lucília de Rezende Naves) e irmão (Adriano de Rezende Naves) que são meus maiores tesouros, meus maiores amores, meus grandes ensinamentos, minhas maiores verdades...por vocês e com vocês a força se reconstrói. À todos os meus familiares, em especial, à minha prima Débora Naves, meus primos Alexandro Rezende e Soraya Fleicher, tia Edyr, tio David, tia Raquel, tia Maria, pelos eternos momentos de alegria, carinho, apoio e dedicação ao longo da minha vida e, principalmente, colaborando e incentivando na continuidade dos meus estudos; Ao meu amor, Mauro Lúcio Vanzelli Marcucci, pelos infinitos momentos de dedicação, respeito, paciência, amizade, ajudas, alegrias, carinho, compreensão e sacrifícios. Eu te amo. À Mikaela Marcucci, pela amizade, respeito, ajuda, compreensão e alegria que tornaram o final desta caminhada mais branda; A família Marcucci pelo carinho, respeito, amizade e acolhimento; Às minhas queridas amigas da minha cidade natal, Brasília, (Benigna Teixeira, Juliana Franco Raulino, Aline Campeche, Karine Ribas, Daniela Damasceno, Amanda Roewer, pelos longos anos de convivência (apesar da distância), amizade, carinho, cuidados, alegrias, apoio e motivação; A minha pequena Rosário, pelos eternos cuidados, amor e carinhos sempre dispensados; Aos meus amigos Mary e família, Shane, Christina, Sushil, Choortee, Karina e Daniela Resende Bruno pelo apoio, amizade, alegrias e dedicação durante meu estágio no Texas (EUA); Aos meus mascotes adotivos, Maggie e Mingau, pelos eternos momentos de descontração e alegrias durante meu doutorado em meio a tantos tumultos diários; Agradeço à Universidade de São Paulo, à Faculdade de Medicina Veterinária e Zootecnia, e ao Departamento de Reprodução Animal pelas oportunidades proporcionadas, pelo apoio incessante ao trabalho, pelo aprimoramento do conhecimento profissional, acadêmico e científico; À CAPES, pela concessão das bolsas de estudos no Brasil e nos Estados Unidos, proporcionando aprimoramento do conhecimento, amadurecimento e experiência profissional com consequente tranquilidade para dedicação deste trabalho; The aim of this study was to analyze the corresponding blood plasma in transitional period of Holstein cows with high production and its relation to the reproductive performance.Therefore, this plasma was analyzed with the use of a triple quadrupole mass spectrometer time-of-flight, for identification of lipids. In dairy cows, the metabolic and hormonal changes during this phase, directly affect the health and productive and reproductive performance. In this period, the negative energy balance is characterized by increased mobilization of energy reserves, usually by fat, due the demands on milk production. In this project, we proposed the study of metabolic condition, especially under a lipidomic context, during the transition period and early lactation dairy cows on two milk productions (High: ≥ 45.9 kg milk/day and Medium: 30 -45,8kg milk/day) during t...

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Postponement of the preovulatory LH surge does not impair the developmental potential of in vivo matured oocytes from eCG/PG-superovulated heifers

Cited by 10 publications

References 0 publications

Reduced Fertility in High‐yielding Dairy Cows: Are the Oocyte and Embryo in Danger? Part I  The Importance of Negative Energy Balance and Altered Corpus Luteum Function to the Reduction of Oocyte and Embryo Quality in High‐yielding Dairy Cows*

Reduced Fertility in High‐yielding Dairy Cows: Are the Oocyte and Embryo in Danger? Part I  The Importance of Negative Energy Balance and Altered Corpus Luteum Function to the Reduction of Oocyte and Embryo Quality in High‐yielding Dairy Cows*

Resposta superovulatória na primeira onda de crescimento folicular em doadoras Nelore (Bos indicus)

<b>Perfil lipídico do plasma de vacas leiteiras segundo abordagem \"ômica\" e sua relação com desempenho reprodutivo<b>

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Postponement of the preovulatory LH surge does not impair the developmental potential of in vivo matured oocytes from eCG/PG-superovulated heifers

Cited by 10 publications

References 0 publications

Reduced Fertility in High‐yielding Dairy Cows: Are the Oocyte and Embryo in Danger? Part I The Importance of Negative Energy Balance and Altered Corpus Luteum Function to the Reduction of Oocyte and Embryo Quality in High‐yielding Dairy Cows*

Reduced Fertility in High‐yielding Dairy Cows: Are the Oocyte and Embryo in Danger? Part I The Importance of Negative Energy Balance and Altered Corpus Luteum Function to the Reduction of Oocyte and Embryo Quality in High‐yielding Dairy Cows*

Resposta superovulatória na primeira onda de crescimento folicular em doadoras Nelore (Bos indicus)

<b>Perfil lipídico do plasma de vacas leiteiras segundo abordagem \"ômica\" e sua relação com desempenho reprodutivo<b>

Contact Info

Product

Resources

About

Reduced Fertility in High‐yielding Dairy Cows: Are the Oocyte and Embryo in Danger? Part I  The Importance of Negative Energy Balance and Altered Corpus Luteum Function to the Reduction of Oocyte and Embryo Quality in High‐yielding Dairy Cows*

Reduced Fertility in High‐yielding Dairy Cows: Are the Oocyte and Embryo in Danger? Part I  The Importance of Negative Energy Balance and Altered Corpus Luteum Function to the Reduction of Oocyte and Embryo Quality in High‐yielding Dairy Cows*