 That's 800-420-1200. We'd love to hear from you. Get rid of those internal parasites and lice that have affected your cattle throughout the winter by taking advantage of Powell Feed and Milling's special Poron Warmer. $58 on Saturday only during the month of June for Ivermax and Ivermectin 5-liter containers. That's right, $58 on Saturday only for Poron Warmer's at all Powell Feed and Milling locations. So hurry over and take advantage of this offer.