OBJECTIVES Considerable interest and controversy over a possible decline in semen quality during the 20th century raised concern that semen quality could have reached a critically low level where it might affect human reproduction. The authors therefore initiated a study to assess reproductive health in men from the general population and to monitor changes in semen quality over time. DESIGN ...

OBJECTIVE To determine if there are areas of major and minor perfusion in a single testicle, and if the quality and quantity of sperm are correlated with the level of perfusion, we collected testicular tissue from areas with different levels of perfusion. DESIGN Controlled clinical study. SETTING Consecutive patients with azoospermia. PATIENT(S) Patients with azoospermia undergoing testic...

Bone morphogenetic protein 15 (BMP-15) expression has been detected in the testis, but its roles in this organ has not been well elucidated. We evaluated polymorphisms of the BMP-15 gene by PCR-SSCP and PCR-RFLP in 212 Chinese Holstein bulls, and investigated possible associations with sperm quality traits, including semen volume per ejaculate, sperm density, fresh sperm motility, thawed sperm ...

When ejaculates from rival males compete for fertilization, there is strong selection for sperm traits that enhance fertilization success. Sperm quantity is one such trait, and numerous studies have demonstrated a positive association between sperm competition and both testes size and the number of sperm available for copulations. Sperm competition is also thought to favor increases in sperm qu...

the objective of this study was to evaluate the importance of environmental and genetic factors affecting semen quality; sperm volume (sv), sperm concentration (spco), total sperm (ts), fresh sperm motility (fsm), total fresh motile sperm (tfms), post thaw sperm motility (ptsm), total post thaw motile sperm (tptms), number of produced payout (npp), number of fresh motile sperm in each milt ejac...

Semen quality is a key indicator of the male reproductive ability. The decline in semen quality has been debated for several decades. However, data on decline in semen quality might be inconsistent given factors such as geographical area, ethnicity, environmental exposure and lifestyle changes. This study aimed to provide information on the semen quality of men in Northern Taiwanese. We recruit...

background: sperm dna damage is an important factor in the etiology of male infertility. objective: the aim of the study was to evaluate the association of oxidative stress induced sperm dna damage with the pathogenesis of male infertility. materials and methods: the study comprised a total of 66 subjects, including fertile men (n=25) and infertile men (n=41) matched by age. seminal malondialde...

background: there is growing concern that occupational, environmental and lifestyle factors adversely affect male reproductive health. fumaria parviflora lam. is being used traditionally in persian folk medicine to cure various ailments and has been supposed to have fertility-enhancing properties. objective: a dose-response study was designed to assess effects of f. parviflora ethanolic leaves ...