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==Blood groups==
 
==Blood groups==
The number of blood groups varies between the domestic species and are determined by antigenic components on the surface of the red blood cells. Cattle have the most complex blood systems while cats are quite simple.
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The number of blood groups varies between the domestic species and are determined by the presence of antigenic components on the surface of the red blood cells. Cattle have the most complex blood systems while cats are quite simple.
 
Normally an animal will not have antibodies against antigens present on the surfaceof its own red blood cells or against blood group antigens of that species unless they have been produced following pregnancy, a previous transfusion or a vaccine reaction.  
 
Normally an animal will not have antibodies against antigens present on the surfaceof its own red blood cells or against blood group antigens of that species unless they have been produced following pregnancy, a previous transfusion or a vaccine reaction.  
 
In order to achieve a safe blood transfusion blood typing and sometimes crossmatching of the donor and recipient patient is required. Transfusion of the incorrect blood type can lead to haemolytic transfusion reactions which can be fatal.
 
In order to achieve a safe blood transfusion blood typing and sometimes crossmatching of the donor and recipient patient is required. Transfusion of the incorrect blood type can lead to haemolytic transfusion reactions which can be fatal.
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