Mallaliak, on 07 January 2012 - 09:06 AM, said:
I am just going out with a guess here, since I admittedly did not pay as much attention in school during the one session we had to disect a rat. But does not blood coagulate/dry up once the heart and lunges ceases to work? (Well at certain rate, not instantly) If it does, it would slow or halt the blood, in addition to no heartbeat to pump said blood.
But a thought came to me now of some local news I read 3-4 years ago. (Varnhem, located between Skövde and Skara in sweden for reference). There were some farmers who had issues with ravens, who would kill lambs and sheep to eat up the exposed organs, aswell as eyes and other soft tissue. It does add a bit more food for thought.
Blood coagulates mainly when exposed to air which is why it dries up and stops bleeding when you have a small cut. . This is due to 'platelets in the blood coming into direct contact with the air.' Unless it is a large cut like though a main vein or artery at which point it pumps out (due to the heart beating) at such a rate that the platelets are unable to coagulate fast enough to stop the bleeding. . If a body is cut once the heart stops beating, there will still be some bleeding but the blood will tend to seep out more slowly and at a steady rate, (no pumping effect)
Also, once the heart stops beating, the blood starts to sink due to gravity, to the lower extremeties of the body. If the body of the cow, for instance, is laying down and you start to cut at the top half (from ground level), there would be less blood than if you started at the bottom half.Obviously a lot would depend on how long the body had been dead. An extremely fresh body will still have a fair bit of blood oozing out as it takes a little time for the blood to sink to the lower section of the body.
In the cases of cattle mutikation, the animal is often found the next day, which is considered reasonably fresh. If the animal had been alive when mutilated, I would expect a fair bit of blood at the scene although a lot would depend on how and where the animal had been mutilated. I suppose an expert could do this without cutting a main artery but even so, there would be quite a bit of blood unless it was being mopped up as they went along.
I hope this answers your question