Infertility among couples in Nigeria is causing increasing concern. Investigations have shown a relationship between abnormalities in spermatozoa/semen parameters and the incidence of male factor mediated fertility problems in couples. However, the factors responsible for the sudden increase in semen/spermatozoa abnormalities are not fully understood. In this study, blood and semen samples were...

White rhinoceroses suffer from a low rate of reproduction in captivity. This study examines the role of male reproductive function as a contributing factor. We used ultrasonography to image accessory sex glands, testis and epididymis. Electroejaculation provided 36 ejaculates from 21 rhinoceroses. Based on the percentage of progressively motile spermatozoa, semen was categorized in three groups...

This study was aimed at evaluating the in vitro effects of particulate matter (ranging from 2.5-10 m in an aerodynamic diameter, PM10) from an urban area on the motility of human spermatozoa. Samples of swim up selected human spermatozoa from three healthy men with normal semen parameters, according to WHO guidelines, were incubated for 4 hours with 10, 50 and 75 μg/ml of PM10. Kinetic paramete...

The aim of this review study is to elucidate the effects that phosphodiesterase 5 (PDE5) inhibitors exert on spermatozoa motility, capacitation process and on their ability to fertilize the oocyte. Second messenger systems such as the cAMP/adenylate cyclase (AC) system and the cGMP/guanylate cyclase (GC) system appear to regulate sperm functions. Increased levels of intracytosolic cAMP result i...

In swine artificial insemination, several dose regimens are applied, ranging from 1.5 x 10(9) to 6.0 x 10(9) spermatozoa per intra-cervical insemination dose. A lower sperm dose is more profitable for artificial insemination centres and offers a more effective use of superior boars. To evaluate fertility, 50 boars were used for a total of 10 773 homospermic first inseminations at a dose of 2 bi...

Infection is a powerful mechanism that can lead to sperm damage, deformity and eventually, male infertility. Genital tract infection and inflammation have been associated to 8-35% of male infertility cases. E. coli causes agglutination of human spermatozoa and thus, leading to infertility. This study evaluated if the negative influence of Escherichia coli on the motility of human spermatozoa is...

objective: the aim of this study was to investigate the effects of curcumin on epididymal sperm parameters in adult male navel medical research institute (nmri) mice exposed to sodium arsenite. materials and methods: in this experimental study, we divided the animals into four groups: control, sodium arsenite (5 mg/kg), curcumin (100 mg/kg) and curcumin+sodium arsenite. exposures were performed...

Background: Vitamin E is believed to be the primary component of the antioxidant system in spermatozoa. There is a relationship between activity of these antioxidant and function of sperm. Vitamins E and C which are belong to non-enzymatic antioxidant are used as a supplemented drug to improve sperm quality and male fertility. The present study was carried out to investigate the positive effect...