Glad to hear that your heifer is OK.
Just curious..... Why the wait until five months to dehorn?
For future reference..... IMHO if the calf is born on the place the best time to take care of that chore is while they're still small enough to manhandle. The barns dehorner works pretty well at that age and if you don't want an open wound you can invest in an electric to de-bud 'em. the calves bounce back pretty quick at that age and they usually don't bleed much either.
Here's a site that gives types of dehorners and the current prices for them. If you add up the vet bills for the procedure, they'll pay for themselves in short order.
The Keystone's are for adult cattle and larger calves. They weigh every bit of 20 pounds and are nearly four feet long. They're not fun for either you or the stock in question.
I don't know how slick the vet cut your heifer's horns. On larger horned cattle where you need the man-killer Keystones, I would recommend that you bob the horns down to about two to three inches away from the head, depending on the size of the horns and the age of the animal. Leave 'em a bit longer on older cattle. The reason being is that you want to avoid exposing the sinus cavity. The horns will grow out some with age, however they will remain blunted. Depending on your particular cattle market, bobbed horns will not have a negative effect if you are selling the cattle at auction, where full horns most likely will.
As for the bleeding. Bobbed horns usually don't bleed nearly as bad as when you cut clean down to the skull. I've been a part of separating the horns and manhood from more than a few head of cattle. In my experience you will have some that get pretty bloodied by the dehorning, however, it's mighty rare to loose one to blood loss because of of it.
If you want, you can invest in a pair of hemostats:
And try to pull the blood vessels on the bleeders. Or if you don't have an electric dehorner handy, you can invest in a soldering iron and cauterize 'em that way.
Hope this helps.