With running cattle on the property, you really, really should keep the cattle fenced out of the ponds since the smaller pond feeds those two other ponds. The cattle disrupt the banks (which isn't the biggest problem) but the biggest problem is the pee and poop that they will introduce to the ponds, as well as the sediment that they will stir up as they walk in the water. All those will transfer to the big pond and will make maintaining it very difficult.
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