Sperm Selection
Mostrando 1-12 de 62 artigos, teses e dissertações.
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1. Selection of best videos of the year for 2020
ABSTRACT Purpose: Understanding the effects of high oxidation reduction potential (ORP) levels on sperm parameters will help to identify patients with unexplained and male factor infertility who may have seminal oxidative stress and determine if ORP testing is needed. This study aimed to evaluate the association between seminal ORP and conventional sperm pa
Int. braz j urol.. Publicado em: 2021-02
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2. Comparison of sperm selection techniques in donkeys: motile subpopulations from a practical point of view
Abstract The aim of this study was to compare the post-thaw distribution of motile sperm subpopulations, following simple or colloid centrifugation. A new analysis was used to evaluate the available number of sperm from each subpopulation after each centrifugation protocol. Frozen/thawed semen samples were divided into the following after-thawing treatments:
Anim. Reprod.. Publicado em: 25/11/2019
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3. Mini-percoll gradient may be used for frozen-thawed sperm selection in sheep
RESUMO O presente estudo avaliou o efeito do aumento da força de centrifugação, bem como da redução do tempo de centrifugação e do volume do gradiente de Percoll em diferentes protocolos nos parâmetros espermáticos de ovinos. Foi utilizado sêmen comercial de carneiros da raça Santa Inês, e cinco tratamentos foram realizados: Percoll tradicional e
Arq. Bras. Med. Vet. Zootec.. Publicado em: 06/06/2019
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4. Seasonal variation in sperm characteristics of boars in southern Uruguay
The objective of this study was to evaluate the effects of season, natural photoperiod, and room temperature at the housing facility on boar semen characteristics in Uruguay (34º66'S; 56º29'W). For this purpose, 117 ejaculates, obtained from eight adult males collected through 12 consecutive months, were assessed for sperm viability, DNA integrity, abnorma
R. Bras. Zootec.. Publicado em: 2015-01
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5. Surgery or embolization for varicoceles in subfertile men
BACKGROUNDA varicocele is a meshwork of distended blood vessels in the scrotum, usually left-sided, due to dilatation of the spermatic vein. Although the concept that a varicocele causes male subfertility has been around for more than 50 years now, the mechanisms by which a varicocele would affect fertility have not yet been satisfactorily explained. Neither
Sao Paulo Med. J.. Publicado em: 2013-03
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6. Avaliação do swim-up e do gradiente descontinuo de densidade na pré-seleção do sexo de espermatozoides na produção de embriões bovinos
The purpose of this work was to associate the modified swim-up method with centrifugation in density gradient for the separation of X-bearing spermatozoa. Sperm viability and integrity were evaluated through the Trypan Blue/Giemsa staining method. Quality control of centrifuged spermatozoa was performed in in vitro produced embryos. The results were validate
Arquivo Brasileiro de Medicina Veterinária e Zootecnia. Publicado em: 2012-06
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7. Avaliação da Proporção Sexual de Embriões Desenvolvidos In Vitro e de Progênie a Campo de Touros Jovens. / Evaluation of the Sex Ratio of Embryos Developed In Vitro and in Field Progeny of Young Sires.
Some of the main problems that affect the in vitro production of embryos is the variation among bulls in relation to fertility and the greater birth of male embryos. Many factors can change the ratio 1:1 between the genders, both in the in vitro production of embryos and in the method of artificial insemination. To try to change this sex ratio in vitro, we s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/08/2011
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8. Desvio de segregação em humanos / Segregation distortion in humans
The transmission ratio distortion (TRD), a biological process defined as a deviation from Mendelian predictions, is caused by different mechanisms: nonrandom segregation of chromosomes during meiosis or gametic and postzygotic viability selection. In order to investigate TRD in humans, we have studied a family with an overtransmitted pathogenic deletion in t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/03/2011
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9. Avaliação das características da motilidade (CASA), morfologia e funcionalidade da membrana plasmática (HOST) de espermatozóides bovinos sexados por cimetria de fluxo / Assesment of Motility Chacarteristics (CASA), morphology; plasmatic membrane funcionality (HOST) in flow citometry sex sorted bovine sperm
Sex selecting has a huge impact in dairy and beef production. The only way commercially viable to obtain sex selecting nowadays, is a flow citometry sex sorted sperm technique. Currently sex sorted sperm have been used regularly in Artificial Insemination programs. Meanwhile, there are limitations about non return rate in farm conditions, superficially expla
Publicado em: 2010
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10. Effect of different percoll procedures on sperm quality and in vitro production of bovine embryos / Efeito de diferentes protocolos de Percoll na qualidade espermática e na produção in vitro de embriões bovinos
Techniques for sperm selection are usually used for bovine in vitro embryo production (IVP) to improve semen quality after thawing. Among these techniques Percoll gradient has been the most used. The aim of this study was to evaluate the effect of different volumes of Percoll, time and force of centrifugation on sperm quality, embryo development and sex of I
Publicado em: 2009
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11. SEXAGEM DE EMBRIÕES BOVINOS PRODUZIDOS IN VITRO COM SÊMEN SELECIONADO POR PERCOLL OU SWIM-UP / SEXING IN VITRO PRODUCED BOVINE EMBRYOS WITH SEMEN SELECTED BY PERCOLL OR SWIM-UP
Preimplantation genetic diagnosis (PGD) is becoming a current issue in animal reproduction biotechnology due to economical reasons. Predetermining the sex of offspring is one example of PGD. This study aimed to determine the percentage of male and female bovine embryos in vitro produced after oocyte fertilization with Percoll density gradient centrifugation
Publicado em: 2007
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12. Somatic cytogenetic and azoospermia factor gene microdeletion studies in infertile men
The objective of the present study was to determine the frequency of somatic chromosomal anomalies and Y chromosomal microdeletions (azoospermia factor genes, AZF) in infertile males who seek assisted reproduction. These studies are very important because the assisted reproduction techniques (mainly intracytoplasmic sperm injection) bypass the natural select
Brazilian Journal of Medical and Biological Research. Publicado em: 2006-04