I am probably a little late here. But I will give my two cents. First of all you need to get rid of the yotes that are coming into the heard and especially those that are coming into feast on dead animals and calves. As you probably know the afterbirth is a delicacy to the coyotes. That alone brings them in. With coyotes that thick you need to be there when they come in to check on the cows. That is, as mentioned already evening, night and early morning. If you have a cow or calf die then get it away from the heard and set up away from it with the wind in your favor and ambush them when they come in.
You could use a calf in distress call but that might set off the cows and then you will not be able to get a shot off for all the cows surrounding you.
Good luck and be vigilant.
Just a side note. Once the yotes get a taste of calf they will be back. A study on yotes showed that after a coyote kills a dear it will be a 90%chance it will do it again.
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