Depending on this heifer's behavior, I wouldn't separate them just yet.. see if you can get that calf going and get him on momma... I had 2 hard births this year that required the calf puller.. both were OK up to the hips and then hung up, both on first timers, the first was a small heifer with a 95 lb heifer calf, second was a much bigger (1100-1200 lb) heifer with a 108 lb bull calf. The first pair were the ones that were the worse for wear from it, the heifer was really wobbly for a while, and the calf didn't get up for about 18 hours (fed it 2 servings of colostrum in the evening) but it was good to go in the morning. Second pair, it took the momma 1/2 hour to get up, and the calf I got nursing by holding him up with my knee under the cow, he was hungry and did OK, but had badly contracted tendons.. spent his first week laying down, getting up just to nurse, but he's doing really well now and looks impressive.
That bull isn't getting any more heifers to breed... 3/4 I had to help, but 0 out of 18 cows.. he'll get the cows!