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Lancemart,
When is your heifer due ?
If its soon, give her access to the barn or bring herin.
It is a very very chilly 7 degrees here and solid ice on the ground everywhere.
I would not risk losing a calf.
And, this is her first time.
If she is due in May/June - and you do NOT have a coyote problem--then let her calve in the field, if its near your house and you can watch her.
Single cows having calves, without a herd to help protect them, are more susceptable to coyote preditation.
Put a calf halter on the calf and work with it several times a day--every time you call your cow in for a treat.
I prefer to have our herd calve on clean ground, but we also give them access to our very large 3 sided barn--in the barnlot so we can keep an eye on them.
With all this crazy weather, this winter, its hard to know what is going to happen next, so our plan now is to keep the cows closer to the barn area with less access to the snowy fields.
You have to make adjustments according to weather, situation ( heifer/no herd ), and the amount of time you are willing to spend checking on a first calf heifer.
Lots of variables.
We adjust our plan accordingly.
#1 Goal is for a live, healthy, viable calf and a healthy mom.
Hope this helps.