Sperm morphology varies considerably across taxa, and postcopulatory sexual selection is thought to be one of the main forces responsible for this diversity. Several studies have investigated the effects of the variation in sperm design on sperm function, but the consequences of variation in sperm design on testis morphology have been overlooked. Testes size or architecture may determine the si...

Micropuncture samples taken from the rete testis, caput, corpus and cauda epididymidis of adult rats were assayed for intraluminal sperm concentrations. The amount of fluid resorbed from the efferent duct and epididymal lumen was calculated based on the sperm concentration. Epididymal sperm concentrations increased from the rete fluid to the cauda fluid through the caput fluid. Eighty-nine perc...

background: the role of oxidative stress in endosulfan-induced reproductive toxicity has been implicated. this study was performed to evaluate the possible protective effect of vitamins e and c, against endosulfan-induced reproductive toxicity in rats. methods: fifty adult male sprague–dawley rats were randomly divided into five groups (n=10 each). the groups included a control receiving vehicl...

Evidence that sperm cells share or impart antigenic specificities to fertilized ova and cleaving embryos in animals was first demonstrated indirectly in female animals isoimmunized against sperm or testis cells. While early studies often gave conflicting results, postfertilization infertility effects were occasionally reported. The systematic analysis in animals of anti~ertility e~ects after im...

Sperm-specific natural selection Sperm cells are genetically haploid, but because of the cytoplasmic bridges that link cells, they can be transcriptionally diploid. However, some gene transcripts not shared. Bhutani et al. sequenced single sperm from mice, cattle, and macaques to determine extent distortion in expression these putatively selfish transcripts, which authors call genoinformative m...

The members of the ADAM (a disintegrin and metalloprotease) family are membrane-anchored multi-domain proteins that play prominent roles in male reproduction. ADAM2, which was one of the first identified ADAMs, is the best studied ADAM in reproduction. In the male germ cells of mice, ADAM2 and other ADAMs form complexes that contribute to sperm-sperm adhesion, sperm-egg interactions, and the mi...

background:   objective: the aim of this study was to investigate the effects of aqueous and hydro-alcoholic extracts of lettuce seed on testosterone level and spermatogenesis.   materials and methods: in this experimental study 24 adult male nmri mice weighing 20-25gr were purchased. animals were randomly divided into 4 groups: controls, hydro-alcoholic (200 mg/kg) and aqueous extracts (50, 10...

background: long term alcohol use has been implicated in men with sexual disorders including suppression of testosterone levels as well as testicular morphological changes. objective: this research investigated the ability of telfairia occidentalis (t.o.) to attenuate the damaging effects of alcohol on the testicular parameters. materials and methods: thirty male sprague-dawley rats, 170-190 gr...

background: alpinia galanga (a. galanga) belongs to the zingiberaceae family has anti-oxidant effects in animals and humans body and often is used as medicament or part of medicaments in asian folk medicine for various applications. objective: the objective of this study was to investigate the molecular and biochemical influence of alcoholic extract from the rhizomes of a. galangal on the sperm...

Sperm competition typically favours an increased investment in testes, because larger testes can produce more sperm to provide a numerical advantage in competition with rival ejaculates. However, interspecific variation in testis size cannot be equated directly with variation in sperm production rate--which is the trait ultimately selected under sperm competition--because there are also differe...