It's Friday, and you know what that means. Yes, blogger Scicurious (who brought us the whale threesome) has another post about animal sex research.
This time, it's about chicken sperm. Specifically, whether roosters alter the quality of their sperm depending on how many other roosters they think have been, uh, laying with their hen—and what social status the hen, herself, has.
Believe it or not, studies in various species have shown that males in more dominant roles often produce a LOWER quality and quantity of sperm than those in subordinate roles. This is presumably because the dominant males don't have to compete as much as the subordinates, they get first pick of the females. But this hasn't been tested before, because the animals being studied understandably get annoyed when you try to get between them and their chosen female to get a sample of the semen.
In this case they decided to try again, using chickens. But not your normal chickens, these were Swedish fowl that live in social groups of up to 16 animals. The males form a dominance hierarchy for access to the females. The most dominant males are obviously going to get first crack at the hens, but the hens will often have multiple matings, and sperm competition is intense. Not only do the females go multiple times, the males can ejaculate up to 40 times within a few hours, which often results in quantity over quality, as the sperm quality decreases over time.
They took males of high and low status, and put them through randomized mating trials over several females, ALSO of high and low status. They took the ejaculate and measured the number of sperm, as well as the velocity, or how good their little swimmers were doing.
And the result? Well, you'll have to go read it. There are graphs that are integral to the story, and I don't want to spoil it. Suffice to say, chicken sperm is a lot more interesting than I would have previously guessed.
Image: Some rights reserved by quinn.anya
Beatboxer Tom Thum had ENT doctor and laryngeal surgeon Dr Matthew Broadhurst shine an endoscopic camera down his throat while beatboxing: “I wanted to find out how my larynx functioned when beatboxing compared to how it functions normally with speech, and whether or not there were any abnormalities in my laryngeal anatomy. I also had […]
Gastric bypass surgery is remarkably effective at promoting weight-loss (it cuts the long-term risk of early death from morbid obesity by 40%), and it’s long been presumed that the major action by which it worked was that, by bypassing the parts of the gut where most food absorbtion takes place, it limited the calories that […]
Timothy writes, “Diego Gómez is a Colombian conservation biologist. When he was a college student, he shared a single research paper online so that others could read and learn from it, just as he did. Diego was criminally prosecuted for copyright infringement, and faced up to 8 years in prison.”
If you don’t want to get stuck footing the bill for a hit and run, this dashboard-mounted camera offers up to 2K resolution to make sure you always have a reliable witness, and it’s available in the Boing Boing Store for 30% off it’s usual price.The PapaGo mounts unobtrusively to your windshield to see everything […]
While some people still maintain that everything in Apple’s walled garden “just works” and is immune to the rampant malware of the Windows world, the reality is different. The Mac’s growing market share has made it a much more viable target for malicious actors, and its built-in tools aren’t always enough to fix things. Drive […]
Boasting an IPX6 waterproof rating, the Trakk Bullet Ultra Compact Waterproof Bluetooth Speaker resists dust and heavy rainfall. It’s currently available in the Boing Boing Store.The Trakk Bullet offers the same wireless convenience as other portable speakers, but few are built as tough as this one. Its utilitarian construction is designed to be a totally low-maintenance […]