Summer fly season can take a serious toll on your cattle and your bottom line. Horn flies alone can consume up to a gallon of blood per animal over a 135-day season, contributing to stress, reduced weight gain, and disease spread like pinkeye. The good news? You can fight back with proven feed-through fly control solutions. Whether you choose mineral or block options, our products with Altosid® IGR, ClariFly®, or CTC are designed to interrupt the fly life cycle and protect your herd. Start early, stay consistent, and see the difference fly control can make in your cattle’s performance this summer. The team at Co-op has you covered!
For more information on our mineral line: Mineral Brochure
Co-op Foundation IGR Brood Cow Mineral is a highly palatable, excellent-quality mineral supplement. This supplement is recommended to be fed from March to October to weaned beef cattle on pasture weighing 800 to 1600 lbs. Start feeding before horn flies appear and continue use until cold weather marks the end of horn fly season. This mineral also includes Rumensin®.
Co-op Supreme Cattle Mineral – Altosid is formulated to control flies between the months of March and October for beef cattle weighing 800-1600 lbs.
Co-op Supreme Hi-Mag Cattle Mineral - Altosid is formulated to control flies for beef cattle weighing 800-1600 lbs. On pasture during grass tetany season. This mineral is a nutritional supplement containing methoprene (insect growth regulator) for continuous feeding to cattle through the horn fly season.
Co-op Supreme IGR Cattle Mineral-CTC is recommended to be fed from March to October to weaned beef cattle on pasture weighing over 700 lbs. for control of active infection of anaplasmosis. The active drug ingredient, chlortetracycline, is a broad spectrum antibiotic with a variety of feeding levels for use in beef cattle, non-lactating dairy cattle, and sheep. A Veterinary Feed Directive (VFD) is required to purchase this feed.
We are proud that all of our Supreme Co-op Minerals are Zinpro® Verified. Zinpro ensures that feed products and mineral supplements meet the research-backed Zinpro® Performance Minerals® levels. These proven supplementation rates have consistently demonstrated the greatest benefits for animals at all stages of production.
By choosing a Co-op Feeds Product, you can trust that the mineral you are getting will benefit your operation. With Zinpro Verified minerals, your cattle will receive the optimal nutrition they need for health, growth, and productivity.
To learn more about our partnership with Zinpro®, watch this video!
Multi-species fly control block.
Multi-species fly control block.
Altosid® IGR is a feed-through insect growth regulator that targets horn flies, one of the most economically damaging pests for pasture cattle. When consumed, it passes through the animal and into the manure, where it disrupts the horn fly life cycle by preventing larvae from developing into biting adults. In a 90-day trial, 96% of producers reported improved horn fly control, and over 90% expressed satisfaction with the results. Stocker cattle fed Altosid® IGR also showed a 15.8% increase in average daily gain, demonstrating both health and performance benefits.
Click image to view study.
Click image to view study.
CTC is an antibiotic used in certain mineral products to support general animal health and help reduce infections commonly associated with fly activity, such as pinkeye. Products that combine CTC with (S)-Methoprene offer dual-action protection. CTC helps manage bacterial infections while methoprene works in the manure to stop horn fly development. This combination provides continuous support during fly season, especially in high-stress conditions or when disease pressure is elevated.
ClariFly® is a feed-through larvicide designed for use in both pasture and feedlot settings as part of an integrated pest management (IPM) program. It works by disrupting the development of multiple fly species including house flies, stable flies, face flies, and horn flies in manure. In a controlled 10-day study, cattle treated with ClariFly® showed an average of 96.7% reduction in house fly emergence from manure compared to untreated cattle. It is most effective when paired with proper planning, consistent feeding, and good sanitation practices.
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Start early, stay consistent, and see the difference fly control can make in your cattle’s performance this summer.
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