Results 81 to 90 of about 1,124,248 (284)
Sperm Morphology in Neotropical Primates
Animals, 2019 The morphological and morphometric characterization of spermatozoa has been used as a taxonomic and phylogenetic tool for different species of mammals. We evaluated and compared the sperm morphometry of five neotropical primate species: Alouatta caraya ...
Eliana R. Steinberg +5 more
doaj +1 more source
Sperm traits negatively covary with size and asymmetry of a secondary sexual trait in a freshwater crayfish. [PDF]
PLoS ONE, 2012 In species where females mate promiscuously, the reproductive success of males depends both on their ability to acquire mates (pre-copulatory sexual selection) and ability of their ejaculates to outcompete those of other males (post-copulatory sexual ...
Paolo Galeotti +5 more
doaj +1 more source
Equine Veterinary Journal, EarlyView.Abstract Background Persistent breeding‐induced endometritis (PBIE) is a common reason for mares failing to establish pregnancy. Objective To examine the hypothesis that advancing mare age and embryo donor status predispose to PBIE and compromise fertility.
Tom Stout +3 more
wiley +1 more source
تاکسونومی و بیوسیستماتیک, 2013 In this research, the variation of spermatozoa traits among three male rainbow trout (Oncorhynchus mykiss) was used to examine how the relative influences of sperm density and duration of sperm motility account for sperm competition success.
Hossein Moradyan +3 more
doaj
Male attractiveness is negatively genetically associated with investment in copulations [PDF]
, 2011 In species with high male mating effort, there is a trade-off between mating effort spent in a current mating and resources left for future matings. Males are therefore expected to allocate resources prudently across successive matings.
Engqvist, Leif +2 more
core +1 more source
Equine Veterinary Journal, EarlyView.Abstract Background There is an ethical debate about the application of ovum pick‐up (OPU) and intracytoplasmic sperm injection (ICSI) in mares. Objectives To survey the opinions of equine veterinarians and breeders of sport horses on the ethics of using OPU–ICSI in mares. Study Design Cross‐sectional descriptive study.
Niamh Lewis +7 more
wiley +1 more source
COMP-1 promotes competitive advantage of nematode sperm
eLife, 2015 Competition among sperm to fertilize oocytes is a ubiquitous feature of sexual reproduction as well as a profoundly important aspect of sexual selection.
Jody M Hansen +2 more
doaj +1 more source
Sexual selection and sex allocation in a simultaneous hermaphrodite [PDF]
, 2010 Since Darwin’s pioneering work, sexual selection theory has become a unifying framework in evolutionary biology successfully explaining the variation in sexual dimorphism, reproductive strategies and mating systems. Although, it has long been argued that
Janicke, Tim
core +1 more source
iMeta, EarlyView.The Human Biomarker Navigator integrates the disease continuum, biomarker dynamics, cross‐organ biomarker networks, biomarker classification, and technology‐driven paradigms. It maps how biomarkers link multi‐system physiology and pathology across the nervous, respiratory, endocrine, circulatory, immune, digestive, urinary, reproductive, and ...
Meng‐Yao Li +29 more
wiley +1 more source
Sexual selection and the evolution of brain size in primates.
PLoS ONE, 2006 Reproductive competition among males has long been considered a powerful force in the evolution of primates. The evolution of brain size and complexity in the Order Primates has been widely regarded as the hallmark of primate evolutionary history ...
Michael A Schillaci
doaj +1 more source