Subject: If I donate blood often, would I be decreasing my built-up immunities?

I know that my body has been building immunities throughout my lifetime.
Also that these immunities are contained in antibodies in my blood.  If
I donate blood often enough to replace a large percentage of the volume
of blood in my body, ie; 4 to 6 times a year for 5 yrs. would I be 
reducing the antibodies in my blood and therefore my immunities 
proportionatly.  Thank you, Al  Almag@gte.net

Re: If I donate blood often, would I be decreasing my built-up immunities?