Cattle Embryos
Mostrando 1-12 de 25 artigos, teses e dissertações.
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1. Efficacy and limitations of different approaches to anticipate the diagnosis of pregnancy in cattle
RESUMO O estudo foi planejado para correlacionar exames ultrassonográficos e sorológicos realizados para o diagnóstico precoce (20 a 30d) de gestação. Cento e vinte (n= 120) receptoras bovinas foram sincronizadas (estro=D0), e embriões frescos produzidos in vitro foram transferidos em tempo fixo (TETF, D7). No experimento 1 (n= 46), o diagnóstico de g
Arq. Bras. Med. Vet. Zootec.. Publicado em: 13/12/2019
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2. Embryo competence and cryosurvival: Molecular and cellular features
Abstract Global cattle genetic market is experiencing a change of strategy, large genetic companies, traditionally recognized in the artificial insemination field, have also begun to operate in the embryo market. Consequently, the demand for in vitro produced (IVP) embryos has grown. However, the overall efficiency of the biotechnology process remains low. A
Anim. Reprod.. Publicado em: 28/11/2019
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3. Strategies to increment in vivo and in vitro embryo production and transfer in cattle
Abstract Knowledge of follicular wave dynamics obtained through the use of real-time ultrasonography and the development of the means by which follicular wave dynamics can be controlled have provided practical approaches for the in vivo and in vitro production and transfer of embryos in cattle. The elective control of follicular wave emergence and ovulation
Anim. Reprod.. Publicado em: 28/11/2019
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4. Aspects of energetic substrate metabolism of in vitro and in vivo bovine embryos
Although the metabolism of early bovine embryos has not been fully elucidated, several publications have addressed this important issue to improve culture conditions for cattle reproductive biotechnologies, with the ultimate goal of producing in vitro embryos similar in quality to those developing in vivo. Here, we review general aspects of bovine embryo met
Braz J Med Biol Res. Publicado em: 23/01/2015
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5. Variações climáticas ao longo do ano e resultados da PIVE em doadoras de diferentes grupos genéticos / Climatic variations throughout the years and results in PIVE donors of different genetic groups
Objetivou-se comparar a distribuição dos resultados da PIVE ao longo dos meses do ano em doadoras de diferentes grupos genéticos bovinos. Foram utilizados 2.309 resultados de aspirações foliculares, sendo 960 em fêmeas das subespécies Bos taurus taurus e 1349 em doadoras das subespécies Bos taurus indicus. O regime de manejo dos animais foi o semicon
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/10/2012
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6. CARACTERIZAÇÃO MOLECULAR DOS COMPONENTES DO SISTEMA ANGIOTENSINA-(1-7) DURANTE A DIVERGÊNCIA FOLICULAR E EXPRESSÃO DE GENES DE REPARO DA FITA DUPLA DE DNA EM EMBRIÕES BOVINOS / MOLECULAR CHARACTERIZATION OF THE ANGIOTENSIN-(1-7) SYSTEM COMPONENTS DURING FOLLICULAR DEVIATION AND EXPRESSION OF DNA DOUBLE-STRANDED REPAIR GENES IN BOVINE EMBRYOS
The first study characterized the expression of MAS receptor and key enzymes for Ang-(1-7) production, such as, ACE2, NEP and PEP during follicular development. Furthermore, the regulation of local Ang1-7 system was evaluated after the intrafollicular injection of fulvestrant (an estradiolreceptor inhibitor) in the dominant follicle. Cows were ovariectomized
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2012
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7. Use of chromatin modifying agents in bovine somatic cell nuclear transfer / Uso de agentes modificadores de cromatina na transferência nuclear de células somáticas em bovinos
Embora a transferência nuclear de células somáticas (TNCS) seja uma ferramenta promissora, seu amplo uso é impedido devido às altas taxas de mortalidade durante o desenvolvimento dos animais clonados. Acredita-se que a reprogramação epigenética anormal seja a principal causa desta baixa eficiência. Nós hipotetizamos que agentes modificadores de cro
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/12/2011
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8. Imprinted gene expression in in vivo- and in vitro-produced bovine embryos and chorio-allantoic membranes.
Cloning by nuclear transfer is often associated with poor results due to abnormal nuclear reprogramming of somatic donor cells and altered gene expression patterns. We investigated the expression patterns of imprinted genes IGF2 and IGF2R in 33- to 36-day bovine embryos and chorio-allantoic membranes derived from in vivo- and in vitro-produced embryos by som
Genetics and Molecular Research. Publicado em: 2011
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9. Karyoplast exchange between strontium- and 6-DMAP-parthenogenetically activated zygotes of cattle.
Ooplasmic factors drive nuclear organization after fertilization and are also important for re-programming in nuclear transfer procedures, in which artificial activation is essential for reconstructed embryos to progress in development. The present research evaluated the effect of pronuclear transfer (PT) between zygotes parthenogenetically activated with io
Animal Reproduction Science. Publicado em: 2011
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10. Efeito da progesterona exógena na produção de embriões em novilhas leiteiras / Effect of exogenous progesterone on embryo production in dairy heifers
The reproductive and productive index of dairy cattle in Brazil are below the desirable rates, and, in recent decades, the increase in milk production occurred, partly, more because of the expansion of explored areas and the increase of herds than due to an effective productive increment. The development and application of reproductive biotechnologies are es
Publicado em: 2010
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11. Ativação de genes apoptóticos no bloqueio do desenvolvimento em embriões bovinos / Activation of apoptotic genes at developmental block in bovine embryo development
Maternal-zygotic transition is a complex phenomenon characterized by the initiation of transcription in the embryo and the transition of maternal mRNA with embryonic mRNA. It is believed that the mRNAs and proteins synthethized by the oocyte during its growth and final maturation allow the zygote to develop during the early stages of embryo development up to
Publicado em: 2009
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12. Padrão de metilação da DMR do último éxon do gene IGF2 em ovócitos e células do cumulus de vacas nelore
Assisted reproductive biotechnologies are essential instrument for the modern cattle breeding. In vitro embryo production (IVP) is prominence, situating Brazil as a country that more produce and transfer in vitro embryos in the word. In spite of the IVP big capacity to produce embryos per animal, this production can be better, being the oocyte quality the mo
Publicado em: 2009