This depends on the age of a calf. A calf that is only a few days or a few weeks old will be far more dependent on the milk he's given than on water. Once the calf reaches at least 2 months of age, then start giving him a couple gallons of water.
He'll mostly be getting his hydration from the milk replacer you're giving him (which does contain water, by the way! ). As the calf gets older, he will be drinking more water.By the time he's over 6 months of age, he may be drinking around 5 to 10 gallons a day, depending on his weight.
You should try to drink as much water as you can hold every day. The recommended amount is 64 ounces which is 2 quarts. If you break this up in little amounts throughout the day it isn't as hard to do as you think.
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