How many doe can a buck mate in a year?

The answer is two fold. It depends on the available Does and the Bucks physical condition. A Buck will continuously mate as many times as possible. During the "Rut" the Buck must find the Does-fight rival Bucks-and mate. This takes a tremendous toll on his physical condition. Bucks will loose between 1/4 to 1/3 of their body weight during this time as he is genetically motivated to mate and not eat. So there is no accurate answer other than as many times as possible. It is my understanding and from watching Bucks in the field- that some will loose so much body weight and strength that they may not survive a harsh winter following the Rut.