bmvf, perhaps this link will be helpful. http://www.thepoultrysite.com/publications/1/egg-quality-handbook/30/watery-whites
This will be a little better than taking my word for it.
Hold the phone, here. That same link also lists causes of blood spots and it says "fights or disturbances". If it is being used as a credible source of information on watery whites, is it my understanding that it is also credible on blood spots? Wouldn't fights and disturbances fall under the realm of "stress"?
Just curious....

Also watched the other vid about the stigma and the blood vessels crossing it and it seems to me that something like that could vary according to what has happened to the bird during the development of that ova. What the film doesn't cover is something called collateral circulation. This is something that can develop if normal patterns of vessels are damaged in any way and can result in new vessels being formed around the damaged area. This even happens in the heart vessels after mild cardiac infarctions or even when those arteries become slowly blocked.
in an area of tissue or an organ that blood can reach by more than one pathway. This is often a result of anastamoses, branches formed between adjacent blood vessels. Collateral circulation can be established in the venous system (between veins) or in the arterial system (between arteries). It may arise from pathological conditions such as congestion or ischaemia.
Just for kicks and giggles, let's imagine a chicken has had trauma or even the stress of illness that could cause damage in the form of a clot to these fine vessels around the egg in the early stages and the vessels form collateral circulation that crosses that stigma, couldn't this cause a blood spot?
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