I'm getting a kick out of this thread as most, obviously, have so few cows/calves that they can actually put coats on them!! Actually, so did I but never really had any of 'em calve in the dead of winter. So, how about this: the ranch I lived on/worked on in Wyoming starts calving Feb 1. They calve 1000 mother cows in about a 2.5 month period with 85% of them calving by the end of Feb. I've seen 50 calves dropped in the yard in one night on a regular basis. Just no way to put coats on them! This is in Wyoming where, if you don't get to them, and they haven't made it to the rolled out straw (no way to calve indoors with all those cows), the calves will freeze to the ground!
The rancher rolls out 2000 pound rounds of straw all around the corral area as calving starts. All the cows are on the meadows and all are checked every day by 4 wheeler. Those that are getting heavy are brought into the corral and calf checks are every 2 hours around the clock until the brunt of the cows have calved. If there is room after they calve, they are brought into the barn where they are in a big open, strawed down area. After a couple of days inside, the calf is tagged, dehorned (paste) if it has horn buds, and kicked out with its dam. Sometime the barn gets WAY too full and it's quite 'exciting' to get in there, find calves to drag and tag and get them out with the right mom!
The cows all get scourguard a couple of weeks before calving but the calves don't get anything at birth unless their dams won't feed them. There always seem to be a couple that do go to the warming box or into the house basement! I've seen ears, tails, and feet frozen off. Most survive long enough to get to market anyway. And, there are always a few orphan calves and cows who lose calves so someone is always trying to graft calves at one time or another. That's a whole 'nother interesting process when you do it the old fashioned way: skin the cow's own dead calf, tie the fresh hide on the orphan calf, put it with the cow whose calf's hide is tied on the orphan, and hope for the best! Amazingly, it usually works! Sometime calves are being pulled, sometime there's a c-section. There are maternity pens around the edges of the barn in case something needs hands-on help. Of course, I've also seen calves pulled out in the meadows when they hid when we were checking them because they were calving - or trying to.
I remember the rancher roping one from the ground, tying her off to a tree (probably the only tree out there!), and pulling the calf. Never a dull moment and a fantastic learning opportunity!
In spite of all the exhausting work, this particular ranch usually averages about a 98% calving success rate!
The mantra I learned there was: for healthy, vigourous calves, they can be cold or they can be wet, but they can't be cold AND wet!
This is what I consider a commercial operation in a pretty big way.