ORIGINAL: GMMAT
And deer herds are controlled (by mother nature) using the same principle. In areas of high deer density.....high (>60%) fawn mortality rates (due mainly to fawn abandonment) and does not being bred equate to the same end result (i.e. population determined by numbers the area can sustain).
Conversely.....in the climate I live in.....IF the population were low....I'm betting the fawn survival rate would be >1/doe.
Intresting side note-a doe will almost always concieve two fawns. If the winter is severe enough or if food is scarce enough, one will be misscaried. And if the option is there, it will always be the male. I'm not sure why.