On Friday I collected three feeder calves from a Greytown dairy farm. They are Hereford Fresian cross bulls, black with white faces. The next morning one was slow to feed and as the day went on he became weaker and weaker. We managed to get him drinking a little bit but he was going down hill fast.
The next morning it looked like he would die so we packed him into the horse float and off to the vet. The vet didn't sound to promising but gave him three injections of various stuff and gave us a tube to feed him electrolytes directly into his stomach. By Sunday evening he had completely turned around and could stand on his own accord and drank a litre of milk.
The photos show him rejoining his mates after his near death experience. I can see why people avoid calf rearing as a stressful activity.