We have some pretty wild cattle in our "neck of the woods" and they are often tolerated ( depending on the owner) because they run loose on the range and often do not see humans for months at a time and have to fight off bears, cougars, wolves and what ever else comes along.
However, I don't like them as they disturb the calmer animals, and often rouse them up and lead them off over hill and dale. I have seen a cow that charged a horse and rider, ( her calf was no where around) and just about knocked the horse off his feet. Seen critters that where so crazy that when released from a squeeze, ( they were only clipping the hair so the brand inspector could see the brand, nothing painful happened to the beast) the steer put people on top of that squeeze, and literally tried to climb up it to get at the people on top. They tried to clobber it to get it back down on the ground and off the squeeze!! That is CRAZY!!
My opinion is that beast should be dropped and hauled into the bush for coyote bait. They are crazy and they will hurt someone or kill them. Not worth it in my opinion.
We have tamed down a number of young range cattle, but it takes time and a good corral system and a sturdy squeeze. The animal is put in a corral with water and only a little feed. The next morning they are hungry, they have to come up to where you are to get their hay, or go hungry. If you think they may charge, stand on the outside of the corral, but stand next to the hay on the ground.
It takes a while, but most start to decide you are the reason they get something to eat, and usually start to calm down. Helps if you have a calm old cow that is friendly and will come up for grain or goodies.
Concerning the ownership of the cow. laws vary from area to area, and an attempt to contact the previous owner should be made. In our area there are cattle laws, but also something called "common ownership", or something like that, if a person does not pick up their property for 2 years, and an attempt has been made to contact them, one goes to the cops and they write out a statement that the "property" was abandoned and now belongs to the property owner.
Maybe your local sheriff -cops could help you on this issue. Hope it doesn't get too "sticky" as legal things can.
Not sure I would want this cow, probably tough. Would have to butcher her yourself if no butcher will take her.
Might be able to feed her some goodies and drop her when she is occupied...
Nite Hawk