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How to sort cows
Set up pens and corrals for cattle to be sorted into.
You cannot do any sorting without having other corrals to put separated cattle into. If you are wanting to hold them for a length of time, they will need watering facilities and a feeding and bedding area.
If possible and necessary, access to separate pastures is also necessary to keep the groups from mixing. This step will take significant amount of time to plan and do especially if you don't have the facilities set up yet.