Penises play a key role in sperm transport and in stimulating female genitals. This should impact post-copulatory competition, and expose penis characteristics to sexual selective pressures. Studies of male genitalia have repeatedly reported negative static allometries, which mean that, within species, large males have disproportionally small genitals when compared with smaller individuals. Males of some sperm-storing bat species may stand as an exception to such a pattern by arousing from hibernation to copulate with torpid females. In this study, we measured dimensions of the erected penis in 4 sperm-storing bat species. Furthermore, we collected sperm and evaluated the link between penis dimensions and sperm velocity.
Semen Analysis: Sperm Count Test Procedure and Results
A conception device is a medical device which is used to assist in the achievement of a pregnancy , often, but not always, by means other than sexual intercourse natural insemination , or NI. This article deals exclusively with conception devices for human reproduction. There are many conception devices on the market today that can be used for predicting ovulation so that sperm can be introduced into the reproductive tract of a woman at the appropriate time, whether by sexual intercourse , including NI or by artificial insemination. Ovulation is the time of the month when the oocyte, or egg, is released by the woman. This is identified as the most fertile time in a woman's menstrual cycle.
During in vitro fertilization, eggs are removed from mature follicles within an ovary A. An egg is fertilized by injecting a single sperm into the egg or mixing the egg with sperm in a petri dish B. The fertilized egg embryo is transferred into the uterus C.
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