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I have a six acre pasture with 3 cows and 2 calves that i moved them into today. The cows dont bother the fence but the calves run right under the wire. Ive seen them do this before, they squat down and duck under with the bottum wire running over the back of there neck and down there backs. I have 2 strands of electric fence, both strands have juice going to them. I have a good ground, no shorts in the fence, and a full charge on the wires no matter where I test it. My grounding rod is driven 8 feet into moist ground and my fence charger is good up to 5 miles and plugs into an outlet on the side of my house. The only thing I can think of is there hair insulates them from the charge. Has anone had this happen before or any other suggestion on thinks I can do to stop this?

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I have had these issues. If they can tolerate the shock, get a bigger charger. Make them feel it when they try to cross it. A 5 mile charger probably doesn't have enough juice to really zap an animal when it is around 6 acres.
Most fence chargers are cyclical impedence, meaning they click out the zap. Basically they need to have long enough contact, like 2 or 3 seconds to get zapped. Sounds like they have already learned they can just run through. In the future, you could get them accustomed to a hot wire by setting it up just in side a fenced in area.

Cows don't need much zap, 700-1000 volt equivalents. If you get a fence tester, most better ones will tell you how hard a zap they are getting. Sounds like you might have to rearrange where the 2 hot wires are or add a third.
I have a 5 strand High-Tensile fence and the calves nor the cows have ever challenged it. Even if its off they dont try to get out. Only issue Ive ever had is trying to seperate a bull from cows in heat, I am not sure anything would be good enough to be effective then.
You might try moving the strands a bit lower. Wire for cattle doesn't need to be very high... I'd say 3' - 3 1/2' for the top wire is plenty tall. Unfortunately the calves have already learned they can fit under the bottom wire so adjusting it lower might be a lost cause. However, if they see the wire and do not believe they'll be able to fit underneath, they will probably stop trying. Just food for thought.

I have also learned that some cows just have it in their genes to crawl fence... and yep we get rid of them right away. :)
I've heard of people adding a 3rd wire and then terminating the middle wire straight to the ground on the charger.  That might put the bottom wire low enough to discourage them from trying to go under and should help them get a good shock even if the ground ever gets extremely dry.  Just an idea, although it costs money to add a 3rd wire so I don't know how much I helped.
we have two wires around the hole pasture bout 10 acres both are hot, but each wire is run off its own fencer so if one gets grounded out the other one is still working. the top wire is only waist high an the bottom wire is a 18 inches below that. our pasture is surrounded by crop ground also an to keep the cows and calves from being tempted we have a 30 foot hay strip all the way around the pasture so the cows cant get the taste of the corn havent had a problem since we redid all that.
First hours are key. Set the controller at high frequency and monitor the group for 2 to 4 hours. Do not let them get through during that period and be sure you have high intensity and high frequency across all the fence during that time. If you go over that period, they will get use to stay inside if they have enough food, water, shelter and shade.

A lot of the points that you have made are accurate.. Need good grounding, good fencer.. Also it is important to continue the circuit.. This just means that you do not have a dead end.. Make sure that the electric wires continue around the pasture.

We use many forms of electric fence in our pastures.. We have solar and 12 volt fencers for far pastures and electric fencers for home.. Your Fencer has more than enough power to do your job.. Our fence usually entails both barb and electric fence wires.. The reason we do this is we ground the barb wire fence all along the pasture using steel posts.. Then we run electric wire with insulaters on all the posts.. Then when a calf touches the fence it does not have to ground through its feet it also grounds through the barb wire if it touches both as it tries to go through the fence. Hope this helps

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