Purina Animal NutritionWhen it comes to experts at feeding animals, Purina would be at the top with over 125 years of “Feeding Greatness”. Purina products are researched and tested at their Animal Nutrition Center. Purina has researched and analyzed over 1,500 nutrient combinations. Their 1,200 acre working farm facility has separate units devoted to Equine, Dairy, Swine, Cattle and Companion Animal research. NRS is proud to carry a large variety of Purina products to grow healthier, stronger animals.