October 8, 2015

Above-Average Rainfall Can Lead to Thriving Parasite Population this Fall

Veterinarian addresses myths about fall deworming

Many parts of the United States experienced above-average rainfall last spring,1 and these wet conditions were a favorable environment for parasites to wage war on cattle. However, with autumn approaching, shorter grass and an anticipated freeze, producers shouldn’t let their guard down regarding this ongoing battle. There are many misconceptions surrounding the issue of fall deworming. Here, Dr. Tony Moravec, Merial Large Animal Veterinary Services, breaks down the facts:

Myth #1: Cattle are only going to be on grass for a few more months so there’s no need for an extended-release dewormer.

“It varies by product and parasite, but outside of short-acting ‘purge dewormers’ or white dewormers, most conventional products only work on average 14 to 28 days,” says Moravec.

Breaking the parasite life cycle is critical, as parasites are continually reproducing. Even if your cattle are only going to be on pasture for a few more months, it takes more than 30 days to break the life cycle. The most effective way to manage parasite control is to break the parasite life cycle completely, which can be best achieved with a long-acting dewormer. LONGRANGE® (eprinomectin) is the first – and only – of its kind on the market, offering up to 150 days of continuous parasite control with one subcutaneous injection.2

Myth #2: The first freeze kills off the parasites so it’s not worth the money to treat in the fall.

While the first freeze does cause some parasites to go dormant, it just takes a few days with above-average temperatures afterward to wake them up. “Parasites are opportunistic and will take advantage of any warm weather to start reproducing again,” said Moravec. “Even with cattle on pasture for 60 days, a producer will see increased returns with LONGRANGE.”

Untreated internal parasites can have a number of negative impacts, including, but not limited to: detrimental effect on the immune system,3 decreased appetite,4 decreased weaning weights5 and lower conception rates.6

Additionally, LONGRANGE has been proven to positively impact Average Daily Gains (ADGs). Comparing more than 15,000 head in nine states, stockers treated for parasites with LONGRANGE gained an average of 28 lbs. over 130 days more than those treated with conventional dewormers.7

Myth #3: Extended-release dewormers drive resistance.

Resistance occurs when a parasite population begins to survive treatment from a drug that at one time was effective.8 This can be initiated by giving dewormers too frequently, giving too low of a dose, or using a dewormer that lingers below therapeutic levels too long.8

“The complexity of internal and external parasite species found in cattle means that the potential for resistance exists and must be managed,” said Moravec. “LONGRANGE, with THERAPHASE technology, is no more likely to drive resistance than other conventional dewormers on the market, and has far more long-term benefits for the cattle and the producer.”9

LONGRANGE is available through a prescription from your veterinarian. For more information about how you can incorporate LONGRANGE into your deworming strategy, visit www.theLONGRANGElook.com.

IMPORTANT SAFETY INFORMATION: Do not treat within 48 days of slaughter. Not for use in female dairy cattle 20 months of age or older, including dry dairy cows, or in veal calves. Post-injection site damage (e.g., granulomas, necrosis) can occur. These reactions have disappeared without treatment.

About Merial

Merial is a world-leading, innovation-driven animal health company, providing a comprehensive range of products to enhance the health and well-being of a wide range of animals. Merial employs 6,100 people and operates in more than 150 countries worldwide with more than €2 billion of sales in 2014.

Merial is a Sanofi company.

For more information, please see www.merial.com.

®LONGRANGE is a registered trademark of Merial. ©2015 Merial, Inc., Duluth, GA. All rights reserved. RUMIELR1555 (08/15).

1 May 2015 Was the Wettest Month on Record in the Lower 48 U.S. States. The Weather Channel. Accessed September 1, 2015, from http://www.weather.com/news/climate/news/wettest-month-on-record-united-states-may-2015.

2 LONGRANGE product label.

3 Wiggins CJ, Gibbs HC. Studies of the immunomodulatory effects of low-level infection with Ostertagia ostertagi in calves. Am J Vet Res. 1989;50(10):1764-1770.

4 Stromberg BE, Gasbarre LC. Gastrointestinal nematode control programs with an emphasis on cattle. Vet Clin Food Anim. 2006;22:543-565.

5 Wohlgemuth K, Melancon JJ. Relationships between weaning weights of North Dakota beef calves and treatment of their dams with ivermectin. Agri-Practice. 1988;9:23-26.

6 McPherson WB, Sacek B, Familton A, Gogolewski RP, Ryan WG, Gross SJ. The impact of eprinomectin treatment on dairy cattle reproductive performance in: Proceedings, 44th Annual Meeting American Association of Veterinarian Parasitologists. 1999;41.

7 Data on file at Merial.

8 FDA.gov. Antiparasitic Resistance in Cattle and Small Ruminants in the United States: How to Detect It and What to Do About It. Helpful Information for Veterinarians. Available at: http://www.fda.gov/downloads/AnimalVeterinary/ResourcesforYou/UCM347442.pdf. Accessed September 1, 2015.

9 Dobson RJ, Lejambre L, Gill J. Management of anthelmintic resistance: inheritance of resistance and selection with persistent drugs. Int J Parasitol. 1996;26(8/9):993-1000.