It depends on the size of the calf and cow/heifer, and how far in or out of the birth canal. A calf will start to hang its tongue out when it is starting to get into distress, this can happen well before you see it. <p>A good rule of thumb is about 20-30 minutes from when you see the waterbag with the front feet. If the cow/heifer isn't making any headway it's a good idea to help.<p>Jason Trowbridge<br>Southern Angus Farms<br>Alberta Canada
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