نتایج جستجو برای: semen characteristics

تعداد نتایج: 673044  

Journal: :Asian journal of andrology 2013
Harry Fisch Stephen R Braun

llegations for a worldwide decline in semen parameter values have not withstood scientific scrutiny. Methodological flaws in an influential 1992 paper are summarized here, and studies that have been published since 1992 are reviewed. Of the 35 major studies of time trends in semen quality reviewed here, eight (a total of 18 109 men) suggest a decline in semen quality; 21 (112 386 men) show eith...

Journal: :Human reproduction update 2010
Trevor G Cooper Elizabeth Noonan Sigrid von Eckardstein Jacques Auger H W Gordon Baker Hermann M Behre Trine B Haugen Thinus Kruger Christina Wang Michael T Mbizvo Kirsten M Vogelsong

BACKGROUND Semen quality is taken as a surrogate measure of male fecundity in clinical andrology, male fertility, reproductive toxicology, epidemiology and pregnancy risk assessments. Reference intervals for values of semen parameters from a fertile population could provide data from which prognosis of fertility or diagnosis of infertility can be extrapolated. METHODS Semen samples from over ...

Journal: :Human reproduction 1997
S Berling P Wölner-Hanssen

The aim of this study was to investigate whether the quality of semen has deteriorated during the last decade. Laboratory records containing semen analysis results were reviewed. The records, arranged according to date of birth, are kept in shelves. Every fifth record for analyses performed between 1985 and 1995, and only those of men in infertile relationships, were included. The data were abs...

Journal: :Nigerian journal of physiological sciences : official publication of the Physiological Society of Nigeria 2011
J N Egwurugwu A Nwafor C P R Chike C S Ufearo R C Uchefuna S C Iwuji J E Okwara E A Alagwu

This study was aimed at evaluating the relationship between body mass index, sex hormones and semen characteristics in male adults. 120 male adults aged 20 to 50 years who consented to participate in the study were used. Serum samples collected from each subject were analyzed for luteinizing hormone (LH), follicle stimulating hormone (FSH), prolactin (PRL), progesterone, estradiol and testoster...

Journal: :Reproductive biology 2004
Jerzy Strzezek Leyland Fraser Magda Kuklińska Anna Dziekońska Marek Lecewicz

The aim of this study was to investigate the effect of providing a supplement containing polyunsaturated fatty acids and antioxidants (PROSPERM) on the biochemical characteristics of boar semen. Two sexually mature boars were fed a standard diet with PROSPERM (250 g daily) for a 24-week period. Ejaculates collected prior to supplementation were used as the control. Semen quality and biochemical...

Journal: :Biology of reproduction 2002
Lisa M Thurston Ken Siggins Alan J Mileham Paul F Watson William V Holt

This study investigated two hypotheses: 1) that consistent between-boar variation in frozen semen quality exists and is genetically determined, and 2) molecular markers linked to genes controlling semen freezability can be identified using amplified restriction fragment length polymorphism (AFLP) technology. Five ejaculates were collected from each of 129 boars. Semen was diluted into a commerc...

2017
Yong Zhi Foo Leigh W. Simmons Gillian Rhodes

Facial attractiveness has been suggested to provide signals of biological quality, particularly health, in humans. The attractive traits that have been implicated as signals of biological quality include sexual dimorphism, symmetry, averageness, adiposity, and carotenoid-based skin colour. In this study, we first provide a comprehensive examination of the traits that predict attractiveness. In ...

2015
Sharon T Mortimer Gerhard van der Horst David Mortimer

Computer-aided sperm analysis (CASA) technology was developed in the late 1980s for analyzing sperm movement characteristics or kinematics and has been highly successful in enabling this field of research. CASA has also been used with great success for measuring semen characteristics such as sperm concentration and proportions of progressive motility in many animal species, including wide appli...

Journal: :American journal of epidemiology 2003
M Louise Lawson Maurizio Macaluso Ann Duerr Glen Hortin Karen R Hammond Richard Blackwell Lynn Artz Amy Bloom

The objective of this study was to assess how characteristics of the intercourse and the couple relate to semen exposure during use of the female condom. From 1996 to 1998, 210 women in Birmingham, Alabama, were trained to use the female condom and follow study procedures during a group session and individually practiced inserting the device. The outcome was semen exposure as defined by compari...

Journal: :Fertility and sterility 2001
H Kobayashi K Larson R K Sharma D R Nelson D P Evenson H Toma A J Thomas A Agarwal

OBJECTIVE To examine the relationship between sperm chromatin defects, evaluated by sperm chromatin structure assay (SCSA) and semen characteristics in cryopreserved semen specimens from patients diagnosed with various types of cancer. DESIGN Prospective study. SETTING Andrology laboratory at a tertiary care hospital. PATIENT(S) Cryopreserved semen samples from 12 healthy fertile men and ...

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