Success in sperm competition, occurring whenever females mate with multiple males, is predicted to be influenced by variation in ejaculate quality and interactions among competing sperm. Yet, apart from sperm number, relevant ejaculate characteristics and sperm-sperm interactions are poorly understood, particularly within a multivariate framework and the natural selective environment of the fem...

The collective cheetah (Acinonyx jubatus) population in zoological institutions has never been self-sustaining because of challenges in natural reproduction. A retrospective analysis of North American zoo-breeding records has revealed that >90% of litters produced since 2003 occurred in facilities 'off-display' from the public. We examined seminal, endocrine, and behavioral traits of 29 adult m...

The aim of the study was the electrophoretical identification of molecular forms of selected antioxidant enzymes in dog semen. Ejaculates to be studied were chosen from five dogs, aged from two to eight years. Polyacrylamide gel electrophoresis was carried out under non-denaturing conditions and then gels were stained for the activity of the following enzymes: superoxide dismutase (SOD), catala...

Diet has a profound direct and indirect effect on reproductive success in both sexes. Variation in diet quality and quantity can significantly alter the capacity of females to lay eggs and of males to deliver courtship. Here, we tested the effect of dietary resource limitation on the ability of male Drosophila melanogaster to respond adaptively to rivals by extending their mating duration. Prev...

© Translational Andrology and Urology. All rights reserved. Transl Androl Urol, 2015;4(S1) www.amepc.org/tau testicular cancer (n=1) (there is some overlapping); cause was unknown in 4 cases. Male infertility was the reason for consultation in 13 cases. The men were provided with a 2.5cc syringe for self-measurement of semen volume during ejaculation. Results: In 9 cases, sperm was found in uri...

An inescapable consequence of sex in eukaryotes is the evolution of a biphasic life cycle with alternating diploid and haploid phases. The occurrence of selection during the haploid phase can have far-reaching consequences for fundamental evolutionary processes including the rate of adaptation, the extent of inbreeding depression, and the load of deleterious mutations, as well as for applied re...

The objective of this study was to evaluate the spermatozoa quality of the F4 F5 generation of transgenic rabbit males carrying the mWAP-hFVIII gene in comparison to non-transgenic individuals and previous transgenic generations. Semen samples from 4 transgenic rabbits and 10 randomly selected non-transgenic males of the same breed and age were collected once a week (5 ejaculates per male were ...

Sperm competition theory predicts that males should invest prudently in ejaculates according to levels of female promiscuity. Males may therefore be sensitive to cues in their social environment associated with sexual competition, and tailor investment in sperm production accordingly. We tested this idea experimentally for the first time, to our knowledge, in a mammal by comparing reproductive ...

a:1:{i:0;s:867:"Cystic lesions in midline of prostate are uncommon and considered as congenital disorders. Here we report a 33- year- old male who presented with either azoospermia or decreased ejaculate volume leading to infertility and for whom performing Transrectal ultrasonography had a critical role in diagnosis. The obtained images revealed a congenital cyst of the prostate gland just in ...

Abstract Nocturnal penile tumescence (NPT) has been reported for males of only a few mammalian species, including humans, albeit this scarcity might be an artefact the difficulty documenting it. We investigated NPT in 12 adult male chimpanzees living all-male group at Kumamoto Sanctuary, Japan. Recorded non-invasively with infrared video cameras across 72 nights (6 per individual), we observed ...