Fred,
As a general rule, the farther north ones gets, the larger the deer bodies tend to get. The subspecies have developed that way, as to maximize their particular pluses for survival in their areas. In the hotter regions a large body isn't needed to retain body heat, hence they are smaller. I'm in the mid-large bodied area (North Dakota) and am happy as I hunt for meat, not a rack. I'd be pretty dissapointed to be hunting something for meat that is not much bigger than one of my dogs (comparing body sizes).