When my German friend Nüle was here to look after my chickens after one of
my numerous operations (what a nuisance I must be to her!) one of my
cockerels knocked all the hard covering off one of his spurs.  They are like
long cylindrical nails part way up the leg,  they use them to fight with and
just like toenails, they have a very tender "quick" inside which has an
extensive blood supply.
So this lad, who had taken exception to what another boy had said to him in
the next pen and attacked the wire, was absolutely pumping blood from his
quick.  Of course, it was a Sunday and the only chemist we could find open
could only provide us with a styptic pencil.  It didn't work very well.
Fortunately he recovered anyway.
N is a doctor and when she got home she sent me something called "Lotagen
fluid" to keep in hand in case I need to stop any bleeding faster than a
styptic pencil can.
I am glad to report I haven't had to use it yet but I'm very glad to have it
in my animal/bird first aid cupboard.

Tweed