Why animal's blood is not adjectives for human human being ?

Why animal's blood is not adjectives for human human being ?
there r ample humans and enough blood for very soon.. so v r feeding animals once we receive selfish plenty to donate blood.
because human are selfish
Animals and humans enjoy different DNAs therefore the blood will be rejected when it is transfuse to one another.
U R WRONG...IT IS USEFUL
contains different antibodies, platelets etc that human bodys could counter to. However, other "animal fluids" are prettty safe. Take insulin. Bovine insulin from their pancreas be used before modern technology be used to create genetically produced insulin for diabetics. Hearts from pigs can be transplanted, into humans, but blood is just different
Because we are not animals. They are of a different specie.
Blood serum is extracted from animals and used for preparing vaccines.moreover sometimes confident antigens are injected in animals and the antibodies produced are retrieved and used for humans.So animal blood is also adjectives to humans.
The composition differs.