Hpw to sperm on command

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Who says males are always the persistent sex? Female topi--a type of African antelope--become so intent on mating repeatedly with the most desirable partner that males sometimes have to fend off their aggressive advances to avoid running out of sperm, a researcher reports. The study is the first to suggest that sperm depletion causes such a role reversal in a mammal. Topi are "lek" breeders. For a month and a half each year, males congregate at a mating arena, or lek, to compete for barren patches of about 30 square meters. The biggest, fittest males, known as lek males, command plots in the center of the arena, and females, which come into heat for just 1 day per year, seek them out.
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5 Gross and Amazing Ways Animals Deliver Sperm

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Not Again, Dear. I'm Sperm-Depleted | Science | AAAS

We trained a mature male bottlenose dolphin, Tursiops truncatus, to provide semen samples on command. After completion of the week training period, semen was collected twice weekly and blood was sampled twice monthly for a period of 28 months. Total sperm per ejaculate ranged from near 0 to Testosterone levels ranged from 1.
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Not Again, Dear. I'm Sperm-Depleted

Men, be glad you're not an anglerfish. All well and weird, but how, Raakxhyr asked Weird Animal Question of the Week on Twitter , do those coveted sperm get to the egg? The action all happens outside their bodies, says Marah J.
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Genetic factors are involved, but the underlying cause is unknown. It is a relatively common condition, occurring in approximately 1:2000 births, with males being more commonly affected. Primary craniosynostosis involves the early fusion of one cranial suture, whereas complex craniosynostosis results from the premature fusion of several sutures.
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