You can't "call a Cow", they way you would call a bull. Just doesn't work that way. Saying that, a cow that has lost here calf can usually be attracted by the sound of a calf in distress but only if she lost the calf within the last day, maybe two. She will stay in the general area, usually within a quarter mile.
If someone kills a calf moose and removes it from the area, Momma will come to "investigate" a distress call.
A little caution here too, Momma moose may not be in the best of mood either, she's comming to assist her young who is calling for help. She can get pretty bitchy and those hooves can be deadly.
Those calls are actual moose. Practice them. The better you get,the better the chance of success. Personaly, I prefer a birch bark horn, 18-22 inches long, it reverberates the sounds better.
Let me start by telling you the story of two Johns.
John number one went on a day hike with a couple of friends in the Cascade Mountains about an hour from Seattle. He somehow got separated from his buddies and became lost. John was dressed in casual cloths for a warm weather day hike and had nothing but a lunch with him. He spent three days in those mountains and luckily made it out to tell the story.
John number two, a friend of John number one, was much better prepared when...