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Softened water can be detrimental to birds. Water would have to have very, very high levels of dissolved solids (above 5000 ppm) to have negative effects on poultry. If you have hard water from a limestone aquifer the calcium in the water is used by the birds as part of their mineral requirements.
However, water softeners replace the "hard" minerals like calcium and magnesium with a "soft" mineral, sodium. The sodium and chlorides introduced by a water softener can be detrimental in much smaller amounts than the hard minerals that they replaced.
I'm not saying that all soft water is bad for the birds, but only a lab analysis can tell you what is truly going on and whether the trade-off of sodium for calcium would have any negative impacts on your livestock.
We have fairly hard water. We do get mineral deposits on the nipple waterers in the barn. I run citric acid through the lines to help dissolve it. If some get too bad I actually take needle-nose pliers and crack the deposits from the nipples. For systems like the Little Giant waterers you can just remove and soak the equipment in a mild vinegar solution to remove the deposits.