We analyse a co-evolutionary sexual conflict game, in which males compete for fertilizations (sperm competition) and females operate sperm selection against unfavourable ejaculates (cryptic female choice). For simplicity, each female mates with two males per reproductive event, and the competing ejaculates are of two types, favourable (having high viability or success) or unfavourable (where pr...

This experiment was designed to compare powdered egg yolk with fresh egg yolk in an extender for cryopreservation of Zebu bull semen. Sperm motility, plasma membrane integrity and viability were assessed at different stages of cryopreservation (post-dilution, pre-freezing and post-thawing). Sperm plasma membrane integrity remained similar at all the stages of cryopreservation. Sperm motility an...

OBJECTIVE To evaluate the effects of cigarette smoking on the ability of seminal plasma (SP) to maintain sperm viability. DESIGN Clinical randomized study. Spermatozoa from cigarette smoking or nonsmoking subjects were reconstituted in SP from smokers and nonsmokers and in modified Ham's F-10 medium, followed by sperm quality assessment during a 48-hour incubation period. SETTING Andrology ...

Aerobic conditions are required to maintain the viability of turkey sperm in vitro. In mammalian sperm, excess oxygen during in vitro storage results in lipid peroxidation, causing membrane damage and reduced sperm motility and subsequent fertility. The effect of adding antioxidants to turkey sperm during liquid storage was studied. Semen was collected and pooled from 20 toms and antioxidants w...

OBJECTIVES Although routinely applied in assisted reproductive technology, human sperm cryopreservation is not a completely successful procedure. Adverse effects of cryopreservation on the fertilization capacity, motility, morphology, and viability of spermatozoa have been proven; cryopreservation has also shown a role in sperm DNA fragmentation and infertility. The post-thaw survival of sperma...

The present study was undertaken to examine the viability, motility and morphology of spermatozoa that were frozen-thawed at different temperature followed by the storage at 4oC until 10 hours under the condition of tropical area. The frozen semen derived from a Holstein-Friesian bull with the egg-yolkbase extender was thawed at 23oC or 37oC for 30 seconds or 15 seconds, respectively, and kept ...

Background: Little is known about Giberellic acid, a plant growth regulator used in many countries, on sperm parameters; so this study was conducted to evaluate its effects on sperm parameters. Materials and Methods: A number of twenty seven adult rats were divided into three groups (n=9): control group (C), control-sham group (C-Sh) and treatment group (Tr). The C-Shgroupand the Tr group were ...

Sperm capacitation involves functional changes, such as the removal or appearance of specific molecules and changes in the plasma membrane; the acrosome reaction (AR) is an exocytotic event induced by calcium influx, enabling the spermatozoa to penetrate the zona pellucida. These processes can be achieved only if the spermatozoa have good viability; indeed, determination of sperm viability is u...

The ability of sperm cells to develop colored formazan by reduction of MTT was used earlier to develop a spectrophotometric assay to determine the viability of sperm cells for several mammalian species. It was the objective of the present study to visualize microscopically the location of the formazan in boar sperm cells. The MTT staining process of boar sperm cells can be divided into a series...

Abstract This study aims to determine the effect of giving coconut water and glycerol comet fish ( Carassius auratus ) sperm storage on motility, viability degree fertilization eggs. research was carried out at Fish Hatchery Laboratory, Faculty Marine Fisheries, Universitas Syiah Kuala. method used a Complete Randomized Design (CRD) consisting four treatments with five replications, namely (P0)...