Provide your cattle with the consistent mineral intake they need to thrive with the Purina Wind and Rain High Magnesium 4 Complete Cattle Mineral Feed. Containing 4% phosphorus and 10% magnesium, essential macro and micro trace minerals, and supplemental vitamins A, D, and E, this product provides the complete mineral nutrition to address mineral deficiencies inherent in forages while supporting optimal health, fertility, and growth. This mineral also contains 10% magnesium for cattle grazing when grass grows rapidly and there is a risk of grass tetany. Protect your mineral investment using the patented Storm Formula with large particle size ingredients that reduce waste and optimize consumption. Now you can feed your herd mineral supplementation 365 days a year without weather interruption or water damage. Purina recommends testing your forages to ensure you provide the appropriate mineral and vitamin supplementation to your herd year-round.