Sperm design and variation in the New World blackbirds (Icteridae) [PDF]
, 2009 Post-copulatory sexual selection (PCSS) is thought to be one of the evolutionary forces responsible for the rapid and divergent evolution of sperm design. However, whereas in some taxa particular sperm traits are positively associated with PCSS, in other
AF Malo +81 more
core +2 more sources
Prevalence of Abnormal Semen Parameters among Male Patients Attending the Fertility Center in Khartoum, Sudan [PDF]
Journal of Medical and Life Science, 2022 Background: More than 70 million couples worldwide are affected by infertility. With a male factor infertility account for about half of the cases. Semen analysis is critical for determining male fertility potential. Objective: To estimate the prevalence
Alaa Ali +3 more
doaj +1 more source
Sperm morphology and evidence for sperm competition among parrots [PDF]
Journal of Evolutionary Biology, 2019 AbstractSperm competition is an important component of post‐copulatory sexual selection that has shaped the evolution of sperm morphology. Previous studies have reported that sperm competition has a concurrently directional and stabilizing effect on sperm size.
Luisana Carballo +6 more
openaire +3 more sources
DNA fragmentation index (DFI) as a measure of sperm quality and fertility in mice. [PDF]
, 2020 Although thousands of genetically modified mouse strains have been cryopreserved by sperm freezing, the likelihood of cryorecovery success cannot be accurately predicted using conventional sperm parameters.
Li, Ming-Wen, Lloyd, KC Kent
core +1 more source
Evolution of sperm morphology in anurans : Insights into the roles of mating system and spawning location [PDF]
, 2014 Background: The degree of postcopulatory sexual selection, comprising variable degrees of sperm competition and cryptic female choice, is an important evolutionary force to influence sperm form and function.
Jehle, R, Liao, WB, Lou, SL, Zeng, Y
core +2 more sources
Effect of Phaleria macrocarpa on Sperm Characteristics in Adult Rats [PDF]
Advanced Pharmaceutical Bulletin, 2013 Purpose: The purpose of this study was to determine the effects of Phaleria macrocarpa (PM) on male fertility by assessing its effect on the sperm characteristics which included the sperm count, motility, viability and morphology.
Saadat Parhizkar +2 more
doaj +1 more source
Effect of metabolic and antioxidant supplementation on sperm parameters in oligo-astheno-teratozoospermia, with and without varicocele: a double-blind placebo-controlled study [PDF]
, 2018 Since sperm require high energy levels to perform their specialised function, it is vital that essential nutrients are available for spermatozoa when they develop, capacitate and acquire motility.
Agarwal, A. +8 more
core +1 more source
Quest for An Ideal, Simple and Cost-Effective Stain for Morphological Assessment of Sperms [PDF]
Journal of Clinical and Diagnostic Research, 2015 Background: Recent alarming trends of a substantial rise in the number of cases of infertility with as many as 30-40% being attributed to male-factor associated causes have created a need for further studies and advancements in semen analysis ...
Hemalatha Anthanahalli Lingappa +7 more
doaj +1 more source
Journal of Animal Reproduction and Biotechnology, 2016 The recovery of epididymal sperm in animals is considered as one of the important tools to preserve high value or endangered species. However, there are no appropriate castrating indicators such as months of age in bull, sperm morphology, and motility ...
Sung-Sik Kang +11 more
doaj +1 more source
Sperm morphology and DNA fragmentation after zona pellucida selection
Reproduction and Fertility, 2021 Sperm DNA fragmentation (SDF) and sperm morphological defects can negatively affect ART outcomes. Consequently, there is a need for additional semen processing technique that accounts for sperm DNA status and morphology prior to ICSI.
Rumiana Ganeva +5 more
doaj +1 more source