Results 41 to 50 of about 79,072 (162)

Sperm allocation in relation to female size in a semelparous salmonid [PDF]

Royal Society Open Science, 2016
To maximize reproductive success, males have to adaptively tailor their sperm expenditure in relation to the quality of potential mates because they require time to replenish their sperm supply for subsequent mating opportunities.
Yuya Makiguchi, Masaki Ichimura, Takenori Kitayama, Yuuki Kawabata, Takashi Kitagawa, Takahito Kojima, Trevor E. Pitcher   +6 more
doaj   +1 more source

Evaluation of sperm fertilizing ability using the Sperm Quality Analyzer [PDF]

International Journal of Andrology, 1997
The Sperm Quality Analyzer is an inexpensive device which provides a quantitative estimation of sperm motility. To evaluate the fertilizing ability of human spermatozoa using a Sperm Quality Analyzer, correlations amongst the sperm motility index, the sperm penetration index (as assessed using the sperm penetration assay; SPA), and the fertilization ...
H, Shibahara, S, Naito, A, Hasegawa, M, Mitsuo, M, Shigeta, K, Koyama   +5 more
openaire   +2 more sources

Exposure to ambient ozone and sperm quality among adult men in China

Ecotoxicology and Environmental Safety
Background: Limited evidence exists regarding the association between ozone exposure and adverse sperm quality. We aimed to assess the association between ozone exposure and sperm quality, and identify susceptible exposure windows.
Yadi Shi, Yangchang Zhang, Kun Yuan, Ze Han, Shi Zhao, Zhenyu Zhang, Wangnan Cao, Yufeng Li, Qiang Zeng, Shengzhi Sun   +9 more
doaj   +1 more source

Sperm quality before treatment in patients with early stage Hodgkin’s lymphoma enrolled in EORTC-GELA Lymphoma Group trials

Haematologica, 2009
Background Although widely recommended, cryopreservation of sperm is sometimes not performed for patients with Hodgkin’s lymphoma because of presumed poor sperm quality related to the disease.
Marleen A.E. van der Kaaij, Natacha Heutte, Jannie van Echten-Arends, John M.M. Raemaekers, Patrice Carde, Evert M. Noordijk, Christophe Fermé, José Thomas, Houchingue Eghbali, Pauline Brice, Caroline Bonmati, Michel Henry-Amar, Hanneke C. Kluin-Nelemans   +12 more
doaj   +1 more source

Organophosphorous pesticide exposures and sperm quality [PDF]

Reproductive Toxicology, 2011
Many Americans are exposed to low levels of organophosphorous (OP) pesticides. It is unclear whether these exposures impact sperm production. We investigated whether there was an association between urinary OP insecticide metabolites and sperm concentration and motility in newly married men from a rural area of eastern People's Republic of China ...
Melissa J, Perry, Scott A, Venners, Xing, Chen, Xue, Liu, Genfu, Tang, Houxun, Xing, Dana Boyd, Barr, Xiping, Xu   +7 more
openaire   +2 more sources

Joint and individual associations between multiple vitamins and sperm quality in adult men

Frontiers in Nutrition
BackgroundSeveral studies have suggested that a healthy diet is associated with improved male fertility outcomes. However, the joint and individual associations between the status of multiple vitamins and sperm quality remain unclear.ObjectivesThis study
Wen Yao, Juan Zhang, Weihong Yan, Di Xie, Ping Tuo, Jie Liu, Xiaoling Zhao, Yiwen Xiong, Yang Li, Tiejun Pan   +9 more
doaj   +1 more source

Effects of altered epididymal sperm transit time on sperm quality [PDF]

International Journal of Andrology, 2008
SummaryThe epididymal sperm transit time seems to have an important role in the process of sperm maturation, and it seems that alterations to the transit can harm the process. The aim of the present work was to evaluate the influence of altered sperm transit time through the epididymis on sperm parameters and fertility of rats, as well as the role of ...
Fernandez, Carla Dal Bianco, Porto, Elaine Manoela, Arena, Arielle Cristina, Kempinas, Wilma de Grava   +3 more
openaire   +3 more sources

In vitro evaluation of sperm quality

Animal Reproduction Science, 2008
This paper highlights selected laboratory analyses that are currently used to evaluate sperm, and describes why results from these assays do not consistently correlate with sperm fertility. Reasons for the disconnect between the two are due in part to the definition and reliability of the fertility data collected, to the complexity of the spermatozoon ...
Mocé, Eva, Graham, James K.
openaire   +3 more sources

Superior sperm competitors sire higher–quality young [PDF]

Proceedings of the Royal Society of London. Series B: Biological Sciences, 2003
The evolution of polyandry remains controversial. This is because, unlike males, in many cases multiple mating by females does not increase fecundity and inevitably involves some costs. As a result, a large number of indirect benefit models have been proposed to explain polyandry.
Hosken, D.J., Garner, T.W.J., Tregenza, T., Wedell, N., Ward, P.I.   +4 more
openaire   +3 more sources

Effect of cholesterol-loaded cyclodextrins on bull and goat sperm processed with fast or slow cryopreservation protocols

Animal, 2014
Cholesterol-loaded cyclodextrins (CLC) added to the sperm before cryopreservation enhance sperm quality after freeze-thawing in several cold shock-sensitive species, including cattle and goats.
E. Mocé, C. Tomás, E. Blanch, J.K. Graham   +3 more
doaj   +1 more source