Good parasite control can lead to more milk, which is the ultimate goal of any dairy operation. But as veterinarians across the country can attest, parasites aren’t always given the attention they deserve. Producers typically deworm once – maybe twice – each year, hoping to clean up the herd. While this may spark some initial relief, the parasite burden likely returns within a few weeks to a few months.

To ensure the greatest economic benefit, producers need to be deworming dairy cattle at the correct time of year. Individual programs are ideal in most cases, but they aren’t always practical – especially on large dairy operations. Fortunately, three pre-planned treatments throughout the year can help protect and increase milk production.

Here’s the simple 3X protocol dairy producers can follow for optimal results:


·         Spring deworming

·         Fall deworming

·         Deworming at freshening

Spring Deworming: Defend against flies heading into the summer. Flies cause obvious discomfort to cattle, which can impact a producer’s bottom line through weight loss and decreased milk production. Deworming in the spring also helps protect against losses from internal parasites. Whether external or internal, both can adversely affect a herd’s health and reduce the profits from a producer’s hard work.

Fall Deworming: External parasites, including mange mites and lice, become more active in the cooler months. Not only can they turn a shiny coat into a tattered one, they can also reduce the comfort, efficiency and overall performance of the herd. In today’s market, treating dairy cattle for external parasites is imperative.

Deworming at Freshening: Cows are under considerable nutritional stress during the first months of lactation. While cows can develop a level of resistance to internal parasites, a relaxation period occurs during this time and losses can occur if these parasites are present. Heifers, on the other hand, have not yet built up much, if any, immunity. Deworming cows and heifers at freshening or prior to entering the milk stream helps both get the most from their nutrition and maximize production.

The Right Solution for Deworming Dairy Cattle

To maximize parasite control efforts on the dairy, it’s important to select a broad-spectrum product that can be trusted to work at all three treatments.                  

EPRINEX® (eprinomectin) kills more species and stages than any other brand,1 including horn flies, mange and lice, and requires zero meat withdrawal time or milk withholding when used according to the label. So no matter what time of year, dairy producers can rely on EPRINEX to help keep their herds healthy and stay as productive as possible.

Visit to learn more about effective parasite control on the dairy.


EPRINEX IMPORTANT SAFETY INFORMATION: No meat or milk withdrawal is required when used according to label. Do not use in calves intended for veal or unapproved animal species as severe adverse reactions, including fatalities in dogs, may result.

Merial is now part of Boehringer Ingelheim.

®EPRINEX and the Cattle Head Logo are registered trademarks of Merial. ©2017 Merial, Inc., Duluth, GA. All rights reserved. RUMIEEP1725 (05/17)


1Based on FOI summaries and label claims.