Sperm Production
Mostrando 1-12 de 141 artigos, teses e dissertações.
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1. Utilização da lipoproteína de baixa densidade, em diferentes concentrações, em meio diluidor para criopreservação do sêmen ovino
RESUMO A utilização da gema de ovo dificulta a padronização de meios diluidores e apresenta riscos biológicos. Assim, este estudo avaliou diferentes concentrações da lipoproteína de baixa densidade (LDL), em substituição à gema de ovo, para a confecção de diluentes para criopreservação espermática em ovinos. Foram utilizados um diluidor contr
Arq. Bras. Med. Vet. Zootec.. Publicado em: 13/12/2019
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2. Association of L-arginine with heparin on the sperm capacitation improves in vitro embryo production in bovine
Abstract We aimed to evaluate the effects of L-arginine (L-arg) in the quality of in vitro heparin-induced capacitation of cryopreserved bovine spermatozoa and its effects on IVP. The experimental groups were: Control 0 hour without pre-capacitation, and groups of sperm capacitated for 30 min in the absence of COC with heparin (Control 30 min), with 1 mM L-a
Anim. Reprod.. Publicado em: 25/11/2019
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3. How diseases became “genetic”
Resumo O presente artigo tem o objetivo de examinar as origens do termo “doença genética. No final do século XIX e início do XX, a vaga ideia que a doença manifesta entre familiares refletia uma “predisposição” familiar, foi substituída pela visão que essas doenças possuem causas específicas, enquanto a genética mendeliana forneceu as pista
Ciênc. saúde coletiva. Publicado em: 26/09/2019
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4. Qualidade seminal e perfil metabólico de caprinos alimentados com semente de linhaça na dieta
RESUMO O objetivo da presente pesquisa foi avaliar o efeito da inclusão de semente de linhaça na dieta sobre a qualidade seminal e o perfil metabólico de machos caprinos. Foram utilizados 16 machos da raça Saanen, distribuídos aleatoriamente em quatro grupos, recebendo níveis de inclusão de semente de linhaça (0, 4, 8 e 12%) na dieta, durante um per�
Arq. Bras. Med. Vet. Zootec.. Publicado em: 14/06/2019
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5. Impact of testicular sperm extraction and testicular sperm aspiration on gonadal function in an experimental rat model
ABSTRACT Purpose To assess the impact of sperm retrieval on the gonadal function of rats with impaired spermatogenesis by comparing testicular sperm extraction (TESE) to aspiration (TESA). The efficacy of these procedures to sperm obtainment was also compared. Materials and Methods A pilot study showed impaired spermatogenesis, but normal testosterone (T)
Int. braz j urol.. Publicado em: 2018-02
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6. Reproductive effects of the psychoactive beverage ayahuasca in male Wistar rats after chronic exposure
Abstract Ayahuasca is a psychoactive beverage used ancestrally by indigenous Amazonian tribes and, more recently, by Christian religions in Brazil and other countries. This study aimed to investigate the reproductive effects of this beverage in male Wistar rats after chronic exposure. The rats were treated by gavage every other day for 70 days at 0 (control)
Rev. bras. farmacogn.. Publicado em: 2017-06
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7. Effect of photoperiod on sexual activity of boar
The main objective of this study was to assess the effect of photoperiod on sexual activity of three breeds of boars: Swedish Landrace (n=34), Large White (n=38), and Duroc (n=32). Boar sexual activity was analysed based on the libido index and intensity of ejaculation. The libido index was calculated as the ratio between the duration of ejaculation and time
R. Bras. Zootec.. Publicado em: 2015-08
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8. Influence of european quail breeders age on egg quality, incubation, fertility and progeny performance
The influence of age (85, 140, and 270 days) of European quails breeders on the egg quality and hatching, fertility and progeny performance was evaluated. The experimental design was completely randomized in a 3x3 factorial arrangement (females' age x males' age), with ten replicates and six birds per experimental unit (four females and two males). Egg produ
Rev. Bras. Cienc. Avic.. Publicado em: 2015-03
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9. Targeted disruption of the mouse testis-enriched gene Znf230 does not affect spermatogenesis or fertility
The mouse testis-enriched Znf230 gene, which encodes a type of RING finger protein, is present primarily in the nuclei of spermatogonia, the acrosome and the tail of spermatozoa. To investigate the role of Znf230 in spermatogenesis, we generated Znf230-deficient mice by disrupting Znf230 exon-5 and exon-6 using homologous recombination. The homozygous Znf230
Genet. Mol. Biol.. Publicado em: 21/10/2014
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10. Development of the male reproductive system in Callinectes ornatus Ordway, 1863 (Brachyura: Portunidae)
This study describes the histology and histochemistry of the male reproductive system in Callinectes ornatus, comparing juvenile and adult developmental stages. We also analyzed changes in the gonadosomatic (GSI) and hepatosomatic (HSI) indices, and the weights of the testis and vas deferens during the development. The results showed that all stages, beginni
Nauplius. Publicado em: 2013-12
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11. Microdissection Testicular Sperm Extraction (micro-TESE) as a Sperm Acquisition Method for Men with Nonobstructive Azoospermia Seeking Fertility: Operative and Laboratory Aspects
Introduction Rare foci of sperm production may be found in up to 60% of men with nonobstructive azoospermia (NOA). Sperm production, if present, is minimal for sperm appearance in the ejaculate. Given that there are no treatment options to restore fertility, sperm retrieval is the only alternative to find testicular sperm than then can be used for in vitro
Int. braz j urol.. Publicado em: 2013-06
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12. Laboratory processing and intracytoplasmic sperm injection using epididymal and testicular spermatozoa: what can be done to improve outcomes?
There are two main reasons why sperm may be absent from semen. Obstructive azoospermia is the result of a blockage in the male reproductive tract; in this case, sperm are produced in the testicle but are trapped in the epididymis. Non-obstructive azoospermia is the result of severely impaired or non-existent sperm production. There are three different sperm-
Clinics. Publicado em: 2013