I don't know how big your stock tanks are but for our horses I built a plywood box insulated with 1" styrofoam all around and built a lid with an opening large enough for them to get their mouth in (actually it's too big 'cause two of 'em can both stuff their noses in there and drink) and use a 10gal "muck bucket" for holding the water. I heat that with a heat tape, the type you would use for keeping your downspouts clear etc.
It only ever got a skim of ice at around 30 below which they had no problem breaking through. It does not use much for power.
There are also some interesting designs online for solar heated stock tanks.
http://www.builditsolar.com/
If you built something that was well insulated you might even be able to bury a coil of pipe below the frost line to circulate water through and use it to pull some heat from the ground below. Kind of a poor man's heat pump.
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Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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