If there are 700 antlerless elk at the feedground, if at least 160 of those are calves, it's a pretty good prospect for next general season, and should produce a harvest of 60 or so spikes out of that 800 elk (80 bull calves less nonhunting mortality and survivors). That figures out to 30 calves per 100 cows, a decent ratio.
If only 115 of those 700 antlerless elk are calves, or less, it's looking pretty lean. 20 calves per 100 cows is poor recruitment, and now it's more like 40 spikes in the harvest from that 800 elk.
If more than 200 of those 700 are calves, recruitment was really good, and there should be a bunch of spikes to shoot come fall.