Sentences with phrase «by copulation»

Ovulation induced by copulation (breeding), and if fertilization fails to occur, a «pseudo-pregnancy» of 42 days will occur.

To be sure, death by copulation is rare.

Not exact matches

The beautiful eighteenth - century costumes and setting seduce us into viewing these affairs with a kind of horrified detachment, as though we were watching a «Nature» film on PBS showing the praying mantis being devoured by his mate in the act of copulation.

Once a female baboon mates with a preferred male, it is in her best interest to give that male's sperm the best chance to fertilize her eggs by avoiding further copulation.

Hoogland and his research assistants were able to document 2,504 copulations by 1,426 females living under natural conditions from 1978 through 2012.

Artificial insemination (AI) is when sperm is placed into a female's ovarian follicle (intrafollicular), uterus (intrauterine), cervix (intracervical), or fallopian tubes (intratubal) using artificial means rather than by natural copulation.

The researchers believe the hormonal surge experienced by the Japanese macaques during breeding season and the close cooperation between these primates and Sika deer culminated in this copulation behavior between two unrelated species.

The worms are capable of sucking out the sperm following copulation, but some worms have evolved filamentous structures on the sperm heads help protect against such manipulation by anchoring the sperm inside the antrum.

In these organs, sperm can remain viable for weeks or months, or can be displaced by the sperm of a new suitor as the female remates.JOHN BELOTE, MOLLIE MANIER, AND SCOTT PITNICKVISUALIZING SPERM WARS Though it is difficult to see what goes on inside a female fruit fly after copulation, recent genetic advances have allowed scientists to image sperm competition inside storage organs — the seminal receptacle and spermathecae — of female Drosophila melanogaster.

Some female strategies for thwarting sexual manipulation by the males are more subtle, such as the vaginal contractions of female garter snakes, which shorten copulation duration and may limit the damage inflicted by the male's hemipenises.

By mating males of each fluorescent color to a single female, the researchers could visualize how sperm behaved and were displaced inside the female sperm storage organs during sequential copulations.1

However, our understanding of reproductive behaviour in internal fertilizers has been revolutionized by the realization that females often copulate with more than one male, providing the scope for sexual selection to continue after copulation [2].

The story: After 10 years of marriage, Jay (Jason Segel) and his blogger wife Annie (Cameron Diaz) try to rekindle their once - amazing sexual chemistry and stamina by making a three - hour video of themselves having sex according to the famous 1972 copulation manual, The Joy Of Sex.

That Nepalese scene of mythological copulation has a dance - like energy to it, accentuated by the many radiant arms spreading out from the central figures, making it all the perfect subject for a gift to Merce Cunningham.