Yeah, that first colostrum is vital. We still keep a gallon of frozen colostrum in the freezer, even though with only 3 adult cows, we haven't needed it. When we had 60-70 calves a year, there were always a couple whose mothers didn’t produce enough high quality colostrum in the vital first 12 hours. They lose the ability to absorb the antibodies very quickly. So, having some frozen (always from a healthy older cow who had been around long enough to have been exposed to multiple nasties) was a literal lifesaver.
When the Miracle calf was born 7 weeks early, I had to use a baby bottle and nipple to get the 12 ounces she needed into her... normally, on one that weak, I would have used a stomach tube, but we didn't have anything nearly small enough! She could only suck for a few seconds at a time at first, before getting too exhausted, so I spent several hours the first day feeding her. But it worked!
Summerthyme