Don't worry about using preservatives to keep your sow in heat, dominant wild boar, or just plain old boar or sow urine attractant good. You can put it in a food saver bag and freeze it it until you need it. Just do your best to recognize the signs of a sow in heat before you label it as such. Either way, the more you collect your urine and the more you do research on wild boar, feral hogs and sow in heat, the more you will learn and the better you will get at hunting them and collecting their urine. It just takes practice and recognition; once again, keep hunting, and researching wild boar and feral hogs and you will become a master!
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