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.

There's a good article in the current D&DH discussing this. I'm also witnessing this in my woods.