This is an interesting question and might have different answers depending on the area. I find this idea interesting
The result of harvesting cows is that the bull to cow ratio goes up significantly. We are told that moose are the most monogamous of the ungulates, a bull usually remains with one cow until she goes out of estrus before going to another one, whereas Caribou, Elk and Mule Deer will have harems that they actively breed from the beginning of the rut.
I was a a seminar this winter in Portland Ore. and one of the guest speakers said the same thing. Every year I see Bull moose with "harems" on average they will have 3 or 4 cows but 5 or 6 is not that unusal and I have seen a bull with 9 cows before.
Nowhere in Southeast Yukon (or anywhere in Yukon that Im aware of) is there a shortage of browse and I have never seen large numbers of old barren cows. I dont know what our bull/cow ratio is but most of the cows get bred and calves are born within a 3 week period. I talked to a Bio about bull/cow ratios and wasnt satisfied with his answer and am not convinced that they know the answer. Any ideas??