The way I look at it the breeding age deer, both male and female respond to the weather, photoperiod, available food sources, etc in a given year. The time of antler growth, breeding, and fawning correspond accordingly the following year. The health of the animal, ability to retain weight/fat storage, age, geographic location, all affect each individual deer and deer population. Management and other interference in the natural course can cause subtle changes that overtime deviate from the natural way of things. Sometimes beneficial, sometimes not.
Nature provides seasonally for what is needed in the seasons to come for all animals, simultaneously it takes away by the same token... Each individual may or may not be prepared to take advantage of this. For every flood there is drouth, for every life there is death.
Just watch the Lion King.
-Those who say money can't buy happiness never bought a dog.