It's not for feeding to the real little baby calves - mix 50/50 with normal milk and feed to the older ones.
Having said which, I hate the stuff. Just like I hate feeding antibiotic milk to calves. It goes like thick yoghurt, leaves clumps of cheese in the milk feeders that are hard to clean, and tastes sour (yes, I do taste it regularly just to find out what I'm feeding the poor babies). In the early stages it smells beautiful, like honey, but already has that sharp taste.
I store all the surplus colostrum during the calving season, try to add fresh to the tank every day, and stir it daily. Because we're not supplying milk to the factory until about 20 cows have been calved 4 days or more, I try to catch the early season milk in another tank, or 44-gallon drums, to use first because milk doesn't have the keeping qualities of colostrum. It's not chilled, and I don't use a preserver. I just mix it with the older calves' milk until it all runs out, then all the calves can have fresh milk (with any available fresh colostrum mixed in) until weaning.
You'd pretty much have to either tip it into the effluent system, or feed a bunch of bull calves (I know a farmer who was doing that rather than storing colostrum) if you didn't do this.
It's also set out in my contract that I'm not allowed to take sale-able milk for the calves till all the antibiotic milk and colostrum is used, and I got interrrogated on what milk the calves were getting throughout calving. I suppose the farm owners actually believe I raised those calves on fresh air.