You just need to manage and bread your 1100 lb cows to wean 600 lb calves.Part of the point of smaller frame cows is you can run more of them. Bigger doesn't mean more profitable. 127-1100 lb cows is probably more profitable than 100-1400 lb cows (same total weight). To keep things simple, say all cows wean a calf. The 1400 pounders wean a 600 lb calf. The 1100 pounders wean a 500 lb calf. The 1100 pounders wean 63,500 lbs total. The 1400 pounders wean 60,000 lbs total likely at a lower price.