sperms are highly specialized cells for delivering dna from male to the ovum. incredibly, wide degree of diversity in sperm morphology in their basic structures i.e. head, middle piece and tail is found across species. differences in terms of overall size of the sperm, shape and number of sperm produced are also incredible. one of the key for this variations or diversity in sperm may be associa...

introduction: semen parameters and specially sperm morphology is used for the assessment of semen sample and for the prediction of the fertilization. however there is semen samples with normal sperm morphology but with hidden sperm chromatin anomalies. since sperm morphology and chromatin anomalies reduce the fertilization rat independently, the purpose of this study is to consider the relation...

the swim-up procedure was used to collect a sperm fraction with improved motility and normal morphology from fertile and infertile semen samples. the untreated and swim-up fractions were analyzed with the hamilton-thorn motility analyser. comparisons were made to see the effect of this sperm selection technique on sperm motility and morphology. they were then examined by transmission electron m...

reproductive parameters evaluation is considered as helpful tool for gene bank formation in ecological and economically important animals species. gloydius halys caucasicus is venomous, viviparous pit viper of northwest of iran. in this research, the spermatic reproductive parameters of this taxon were studied. twenty six male snakes were collected from takht-e-soleiman region between september...

abstract background: aloe vera (aloe barbadensis miller) is an evergreen perennial plant widely used in modern herbal practice and is often available in proprietary herbal preparations. objective: this study was designed to investigate the semen picture and spermatozoa morphology of west african dwarf (wad) bucks treated with aloe vera extract. materials and methods: twelve sexually matured wad...

Semen analysis, sperm DNA fragmentation (SDF) and hypo-osmotic swelling test (HOST) are usually performed for the evaluation of sperm fertilizing ability. There are some debates over the necessity of SDF and HOST incorporation in male infertility work-up.Semen of 77 men was evaluated by SDF and HOST through three semen analyses. Sperm parameters were arranged into different categories: <5%, 5-1...

semen analysis, sperm dna fragmentation (sdf) and hypo-osmotic swelling test (host) are usually performed for the evaluation of sperm fertilizing ability. there are some debates over the necessity of sdf and host incorporation in male infertility work-up.semen of 77 men was evaluated by sdf and host through three semen analyses. sperm parameters were arranged into different categories: < 5%, 5-...

The swim-up procedure was used to collect a sperm fraction with improved motility and normal morphology from fertile and infertile semen samples. The untreated and swim-up fractions were analyzed with the Hamilton-Thorn Motility Analyser. Comparisons were made to see the effect of this sperm selection technique on sperm motility and morphology. They were then examined by transmission elect...

introduction: to evaluate and compare efficiency of sil-select with percoll to recover sperm with normal chromatin in morphology and also studyeffect of these parameters on fertilization, embryo quality and cleavagescore. materials and methods: assessment of semen parameters, protamine deficiency (cma3) and excessive histone (aniline blue staining) were carried out before and after sperm proces...

The very low cut-off value for sperm morphology of 4% morphologically normal spermatozoa, as proposed in the new edition of the World Health Organization (WHO) manual on semen analysis, is in agreement with recently published values and reflects the trend of a decline in reported mean values for normal sperm morphology. The reduced value for morphologically normal spermatozoa over the years may...