nycowgirl - I disagree with Aaron. I give 4 ml of BoSe at birth and more if it's over 100#. If I have a calf that does not "act" right or shows signs of SE deficiency, I give it 2 ml next day - wait two days, give another 1 ml.
Yes, SE is toxic - but, years ago "researchers" out here tried to see what level it would take to kill a calf with SE and they were unable to do it.
Do you know how much the vet gave? how much does the calf weigh? At 3 months, it probably weighs at least 200#, so it should have gotten 8 ml right from the start of BoSe.
If you are dealing with MuSe - dosage is different. You give 1 ml / 200# - so, calf should have gotten 2 ml immediately, & I would give 1/2 ml now, and again in few days.
"Drape" calf over a bale of hay or straw to get it "up" for a while.
We are extremely deficient of SE in all of NY. Your cows should be receiving SE in a loose mineral daily - 24/7/365. And, all newborns should get a shot soon after birth.
BoSe & MuSe are basically the same, just different concentration. I always say "B" for Baby and "M" for Mama.
After being tested, our mineral is mixed with 3X the recommended dosage. I would not recommend anyone to jump right in & double or triple the dosage, but I'm saying that's how SE deficient this area is.
It affects cows cycling, breeding, calving, retained placentas, mastitis, course rough hair coats, poor growth, dumb suckers - you name it - it just about affects it.
If calf doesn't die from complications like respiratory problems, it should recover.
I think you know me, you can call or email me anytime.