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siring in Medical News

Farming, Fatherhood Hallmarks of Men Who Live to 100

... than other men in this sample. "This may be due to the support by the children when the person becomes older," Gavrilov speculated. Alternatively, siring many children "could be an indicator of good general health and attractiveness on the marriage market, leading to earlier marriage and hence to more k...

Having Lots of Kids Helps Dads Live to 100

... than other men in this sample. "This may be due to the support by the children when the person becomes older," Gavrilov speculated. Alternatively, siring many children "could be an indicator of good general health and attractiveness on the marriage market, leading to earlier marriage and hence to more k...

Female Ducks Develop Complicated Genitals to Outwit Aggressive Males

...my evolves as a countermeasure against aggressive males. Once they choose a male, theyre making the best possible choice, and thats the male they want siring their offspring, she said. They dont want the guy flying in from who knows where. It makes sense that they would develop a defense. Dr. Brennan s...

Female Ducks Develop Complicated Genitals to Outwit Aggressive Males

...evolves as a countermeasure against aggressive males. “Once they choose a male, they’re making the best possible choice, and that’s the male they want siring their offspring,” she said. “They don’t want the guy flying in from who knows where. It makes sense that they would develop a defense.” Dr. Brenna...

Males Lifespan Shortened By Elevated Levels Of Testosterone

...ut North America. They injected males with elevated levels of testosterone and found that they had shorter lives but that they were very successful at siring more offspring ? even with females who were mated with other males. "The surprising result was that testosterone-treated males had a higher ove...
siring in Biological News

Males with elevated levels of testosterone lead shorter lives but have more success siring offspring

Comparative studies have studied testosterone levels and related them to mating systems and aggression, but very few studies have attempted to relate testosterone to fitness, that is, the combination of lifetime reproductive success and survival, in the wild or experimentally. Over nine breeding se...
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