In the presence of UVJ extracts, sperm swam vigorously even after 48 h of incubation, whereas in the absence of the extracts, they usually died within 5 h data not shown. More importantly, the addition of UVJ extracts extended the sperm's lifespan in vitro. National Center for Biotechnology InformationU. Acta Anat ; This article has been cited by other articles in PMC. To achieve fertilization, the sperm must encounter the oocytes at the right time and at the right place. A novel role for the pseudospermathecae".
The flagellar movement of the sperm was recorded using a high-speed camera.
Sperm storage in the female reproductive tract in birds.
Sperm storage in caecilian amphibians. In some cases, such as in the yellow dung flycertain male traits will affect the fitness of eggs laid in particular environmental conditions. There are several reports indicating that sperm release from the SSTs is not regulated but occurs in response to the mechanical pressures of a passing ovum, as no contractile elements associated with the SSTs were found [ 2036 ]. Journal of Zoological Systematics and Evolutionary Research. J Anim Sci ; In addition, Burke and Ogasawara [ 16 ], who recovered sperm from an inseminated hen oviduct, concluded that sperm release from the SSTs is a slow and continuous event that occurs constitutively during the ovulatory cycle. To test whether hormonal stimulation causes sperm release from the SSTs, birds were injected with various steroid hormones, and the SST filling rate was calculated.