Objective Due to the worldwide increase in infertility, it is both necessary and important to have assisted reproductive technology (ART) registries. In Iran, donation and surrogacy programs are approved by decrees from religious scholars. ART has been used since 1984 in Iran and the first Iranian infant conceived by gamete intra-fallopian transfer (GIFT) was born in 1989. This report, however,...

any veterinarians and AI stud managers have inquired about the significance of cytoplasmic droplets on boar sperm cells. I currently advocate using ejaculates for artificial insemination (AI) which have fewer than 20% morphologically abnormal sperm, with no more than 15% attributable to cytoplasmic droplets. There is, however, little published research on cytoplasmic droplets and their effect o...

OBJECTIVE Melatonin, the chief secretory product of the pineal gland, regulates dynamic physiological adaptations that occur in seasonally breeding mammals as a response to changes in daylight hours. Because of the presence of melatonin in semen and the mem- brane melatonin receptor in spermatozoa, the impact of melatonin on the regulation of male infertility is still questionable. The aim of t...

The fine structure of the developing spermatids and the mature sperm of Nippostrongylus brasiliensis was investigated. Immature spermatids are found at one end of the tubelike testis, and the mature sperm at the other. The spermatid has a prominent nucleus, with the chromatin clumped at the margin. It also contains a pair of centrioles, located near the nucleus. The cytoplasm is filled with rib...

It is known from genetic analyses that maternal inheritance of cytoplasmic organelles is the rule among plants and animals. Although recognized as one of several possible mechanisms for strictly maternal cytoplasmic inheritance, exclusion of sperm cytoplasm at the time of gametic fusion has remained poorly documented for the flowering plants. In the present investigation, enucleated, cytoplasmi...

We have studied the chromosome condensation activity of mouse oocytes that have been inseminated during meiotic maturation. These oocytes remain unactivated, and in those penetrated by up to three or four sperm, each sperm nucleus is transformed, without prior development of a pronucleus, into metaphase chromosomes. However, those penetrated by more than four sperm never transform any of the nu...

This study aimed to evaluate the effect of a sublethal dose of gossypol (20 mg/kg BW, every other day) on sperm malformed ultrastructure of male rabbits. The experiment lasted 8 weeks. Gossypol administration exhibited: severe deteriorations in the head, connecting piece and midpiece of the sperm; significant increases in the malformed acrosomes; dramatic destructions expressed as degeneration ...

objective: due to the worldwide increase in infertility, it is both necessary and important to have assisted reproductive technology (art) registries. in iran, donation and surrogacy programs are approved by decrees from religious scholars. art has been used since 1984 in iran and the first iranian infant conceived by gamete intra-fallopian transfer (gift) was born in 1989. this report, however...

Previously, it was suggested a relation between the presence of apoptosis markers with cytoplasm in mammalian sperm. In this work, flow cytometry, confocal microscopy and image analysis were used to analyze the relationship between active caspase-3 and -7 and intracellular esterases expression in ejaculated or epididymal ram sperm. Sperm obtained from ejaculates from the caput, corpus, or cauda...